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Results for Equation of Time

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Hands On: Breguet Equation of Time Pocket Watch No. 2492 SJX Watches
Breguet Equation Jan 12, 2026

Hands On: Breguet Equation of Time Pocket Watch No. 2492

A rare Breguet pocket watch with retrograde perpetual calendar and equation of time illustrates the evolution of the house from its founder’s era to the early 20th century, blending historical motifs with modern concessions. Made in 1932, Breguet No. 2492 is one of just four known examples from a series of equation of time movements produced over nearly five decades by the legendary workshops of Victorin Piguet. In short, it’s a watch with one foot in the 19th century and one in the early 20th. The transitional nature of the watch evidently resonated with collectors, as the watch recently sold for CHF241,300 at Phillips’ Geneva auction in November, some 20% above its high estimate. Context It might be surprising, but Abraham-Louis Breguet’s unexpected death in 1823 had no immediate effect on the firm’s output. The firm produced well over a hundred watches each year, which required a staff of skilled workers, as well as A.-L. Breguet’s family, who understood what a Breguet watch was, and could build one without being managed by the man himself. However, with the old guard’s retirement, and general decline of Parisian watchmaking, things slowly changed. After the Breguet family sold the firm in the late 19th century, turning instead to the more lucrative business of aviation, the firm’s output strayed from A.-L. Breguet’s vision, abandoning Breguet’s signature design language for a medley of styles catering to specific markets. During this time, the brand...

In-Depth: A Guide to Every Equation of Time Watch by A.-L. Breguet SJX Watches
Breguet Abraham-Louis Breguet 1747-1823 stands Jun 23, 2025

In-Depth: A Guide to Every Equation of Time Watch by A.-L. Breguet

Abraham-Louis Breguet (1747-1823) stands among the most revered names in horology, celebrated for innovations that shaped modern watchmaking. While his tourbillon, self-winding mechanism, and anti-shock system are widely acknowledged, his work in astronomical timekeeping, particularly equation of time (EOT) watches, remain one of Breguet’s most intricate yet less-explored achievements. With 2025 marking the 250th anniversary of his birth, this guide offers the most comprehensive study of every known EOT timepiece made during his lifetime, including pocket watch no. 160 “Marie Antoinette”, expanding on our prior analysis of the complication (in parts I and II). No. 160 as pictured at the recent exhibition in London’s Science Museum. Image – Baruch Coutts Looking at the stars Breguet operated in an era where precision timekeeping was dictated by astronomy, and his workshop, positioned at the heart of Paris’s scientific and commercial networks, was uniquely placed to serve scientists, navigators, and royalty who required accurate solar and mean time readings. Rather than settling on a single method for displaying and correcting the EOT, he explored multiple mechanical solutions, refining some while revisiting earlier ideas when necessary. His approach does not follow a strictly linear evolution but instead reflects a dynamic cycle of innovation, mechanical experimentation, and adaptation. Breguet’s cam-driven system with feeler to indicate EOT, as found in pocke...

Chronicles of Precision: The Quest for Equation of Time Part II SJX Watches
Nov 19, 2024

Chronicles of Precision: The Quest for Equation of Time Part II

Continuing from part I of the history of the equation of time. In the late 17th century, London’s clockmaking landscape experienced a remarkable surge of innovation and collaboration, fuelled by interactions among prominent horologists and the broader scientific community. Among this period’s leading figures were Christian Huygens and Robert Hooke, who made substantial strides in crafting clocks that could precisely display solar time without the need for cumbersome equation tables. This era marked the advent of the equation cam, a revolutionary mechanism designed to reconcile the disparities between solar time and mean time. Inspired by the analemma-a figure-eight pattern illustrating the Sun’s varying positions in the sky throughout the seasons-these mechanisms featured a distinctive mathematically calculated kidney-shaped cam, symbolising a pivotal step forward in horological precision and accuracy. At the heart of this innovation lies the cam and lever mechanism, an integral component of the invention. It comprises a shaft propelled by the clock’s mechanism, completing a full rotation annually. Affixed to this shaft is a meticulously crafted kidney-shaped cam, tailored precisely to match the annual fluctuations outlined by the equation. This cam engages with a follower and a connected lever, facilitating the seamless translation of its rotational motion into practical adjustments within the timepiece. Drawing of an equation pendulum by Ferdinand Berthoud (1...

Chronicles of Precision: The Quest for Equation of Time Part I SJX Watches
Breguet Marine Tourbillon Equation Marchante Nov 18, 2024

Chronicles of Precision: The Quest for Equation of Time Part I

Central to our comprehension of time is the intricate interplay between the celestial dance of heavenly bodies and the pursuit of accuracy. Throughout history, mankind’s perception and quantification of time has evolved with its interaction with the natural environment. From ancient times when the rhythm of the Sun governed daily existence to the modern day of standardised timekeeping ushered in by mechanical innovations, human ingenuity has been instrumental in shaping this odyssey. Unfolding within this tale is the rare horological complication, the equation of time, a captivating chapter in the ongoing saga of humanity’s temporal exploration. The Breguet Marine Tourbillon Equation Marchante 5887 with its kidney-shaped cam that governs the equation of time display. Image – Breguet Dawn of Timekeeping: Celestial Observations and Ancient Innovations The genesis of civilisation ushered in humanity’s bond with the cosmos, as early communities devotedly charted the celestial events that dictated the rhythm of their lives. This connection was not merely academic; the alternation of day and night, the moon’s phases, and the Sun’s shifting journey through the heavens were the foundation upon which the ancients built their methods of marking time. In civilisations like those of Mesopotamia, Egypt, and ancient China, a deep-seated knowledge of the heavens was crucial for survival. The predictable cycles of day and night governed the timing of essential activities such ...

Equation of Time Introduces the Fat Arrow Collaboration SJX Watches
Omega Jul 25, 2022

Equation of Time Introduces the Fat Arrow Collaboration

Conceived sub-brand of RGM, one of the original independent watchmaker in America, Equation of Time is a maker of affordable watches often created in collaboration with collectors, with the latest being the Fat Arrow Collaboration Watch. The dial of the watch reproduces a 2015 artwork created by watch photographer Atom Moore that’s a riff on the pilot’s wristwatches supplied to the Royal Air Force in the 1950s by brands like Omega and IWC. Like the military-issue originals, the Fat Arrow Collaboration is a compact, hand-wind timepiece with the feel of a vintage remake, but st apart with a dial that’s clearly modern and definitely original. Initial thoughts The Fat Arrow Collaboration (FAC) is one of many watches inspired by vintage military timepieces, but it is cleverly different. It utilises the historical arrow emblem used to mark British military equipment as a decorative element. Mr Moore’s original artwork, Fat Arrow, is an artistically-altered photography of a CK 2777 “Fat Arrow” wristwatch, one of many that Omega supplied to the Royal Air Force starting in 1952. The FAC retains the feel of the vintage original with an identically-sized case, but with Mr Moore’s Fat Arrow mashup as the dial. That makes the FAC different enough, in fact, to be interesting despite being a no-frills watch. Fat Arrow by Atom Moore The dial is covered with both the “Fat Arrow” and “Thin Arrow” in all their respective iterations. That might sound excessive, but ...

INTRODUCING: The collector’s complication – Panerai’s Luminor 1950 8 Days Equation of Time Titanio Time+Tide
Panerai s Luminor 1950 8 Sep 6, 2016

INTRODUCING: The collector’s complication – Panerai’s Luminor 1950 8 Days Equation of Time Titanio

With the release of the Luminor 1950 Equation of Time 8 Days GMT Titanium Panerai is placing one of haute horlogerie’s most misunderstood complications into the classic Luminor package. Primarily known as one of the archetypal tool-watches, this latest release plucks the Luminor from the depths of the ocean and puts it in the planetarium. Panerai … ContinuedThe post INTRODUCING: The collector’s complication – Panerai’s Luminor 1950 8 Days Equation of Time Titanio appeared first on Time+Tide Watches.

Becoming Horological Art: My Transformational Experience With Alexa Meade And The Audemars Piguet Equation Of Time – Reprise Quill & Pad
Audemars Piguet Equation Apr 21, 2021

Becoming Horological Art: My Transformational Experience With Alexa Meade And The Audemars Piguet Equation Of Time – Reprise

It would be relatively easy, and pretty interesting, for GaryG to tell you the story of his two days one summer with artist Alexa Meade and her team. And he’ll get to that, but there’s more: the flood of sensations and emotions that came from considering why time and space are so important to him and from inhabiting a work of art that melded GaryG's vision of himself with the artist’s interpretation and self-expression. And there was even a watch.

Promiscuous Wrist: Girard-Perregaux 1966 Minute Repeater, Annual Calendar & Equation Of Time Revolution
Girard-Perregaux 1966 Minute Repeater Annual Jan 16, 2013

Promiscuous Wrist: Girard-Perregaux 1966 Minute Repeater, Annual Calendar & Equation Of Time

Despite the fact that the Promiscuous Wrist, by definition, gets around a lot, it (or I, I should say) has never had the chance to test-drive a watch with an equation-of-time complication. For that matter, we’ve never had a run around the block with an annual calendar either. So, when the chance came to kill […]

Complicated Collectors: James Ward Packard SJX Watches
Patek Philippe had just completed movement Dec 9, 2025

Complicated Collectors: James Ward Packard

On 27 April 1927 a nurse walked into a room at the Cleveland Clinic carrying a leather case. The patient was sixty-four, a section of skull removed, the ache of radiation still working behind his eyes. On the charts he appeared as James Ward Packard, co-founder of Packard Electric and Packard Motor Car Company. To the nurse he was a difficult case. To Geneva he remained the client for whom Patek Philippe had just completed movement number 198’023, an astronomical watch that had absorbed three years of calculation and bench work. James Ward Packard. Image – Lehigh University Photograph Collection Inside the case lay a carillon minute repeater on three gongs, coupled to a full perpetual calendar with moon phase, equation of time, and sunrise and sunset indications calculated for Warren, Ohio. On the reverse, a deep blue sky disk carried five hundred and twelve gold stars, turning at sidereal speed around a small Polaris. The sky above his birthplace had been compressed into a circle of lapis and gold, moving in his hands as it moved above the town where he had been born, built factories, endowed an engineering laboratory, and which he now understood lay beyond any realistic hope of return. Consolation held little appeal for him. Packard placed his trust in precision, in the ability to describe a situation so exactly that it became bearable. The watch answered a question he had circled since childhood: if the world always exceeds your grasp, can you still know, to the min...

Breguet’s Finest World Time Yet to Celebrate 250 Years SJX Watches
Breguet s Finest World Time Sep 11, 2025

Breguet’s Finest World Time Yet to Celebrate 250 Years

Breguet’s quarter-millennial celebrations continue with the Marine Hora Mundi 5555, a reprise of the unique piece created for Only Watch two years ago. The world time wristwatch now returns with a phosphorescent enamel dial – that is notably grand feu on sapphire crystal – and a case in “Breguet Gold”. While the attire is new, the Hora Mundi 5555 still retains the clever movement that has a world time function that is instantaneously switchable between two pre-set time zones and unique amongst travel watches. Initial Thoughts Breguet facelifted the aging Marine line starting about eight years ago, but the integrated bracelet design language still feels fresh, though arguably remains unproven compared to long-established peers in the luxury sports watch segment. The Marine Équation Marchante 5887, which introduced the new look, leaned heavily on its excellent movement – it’s perhaps the best equation of time complication yet made – as a crutch supporting an experimental design. More practical and simpler models followed; the Marine Hora Mundi is certainly practical but not simple. The Marine Hora Mundi 5555 is likewise powered by an impressive movement, and one incorporating a complication apt for a sports watch, but the watch also has a metiers d’art distinction with its enamel dial. That is unusual for a sports watch, but the Marine is an unusual sports watch. The enamelling itself is even more unusual, done on sapphire using phosphorescent pigments, ...

Style and Substance in Greubel Forsey’s QP Balancier SJX Watches
Greubel Forsey s QP Balancier Greubel Sep 4, 2025

Style and Substance in Greubel Forsey’s QP Balancier

Greubel Forsey repackages its cutting edge perpetual calendar in a sleeker, more accessible format as the QP Balancier. It’s still a highly legible calendar that adjusts forward and back via the crown without need of tools or fear of damage. Despite the simpler styling, the QP Balancier retains the high-end movement decoration the brand is known for. Initial Thoughts Greubel Forsey was arguably a latecomer to the world of complications, spending its first decade on chronometry, refining the tourbillon. The brand’s first complication, the GMT presented in 2011, applied an unfamiliar approach to a familiar complication. That set the tone for the brand’s first perpetual calendar four years later – the Quantième Perpétuel à Équation. At its heart was a “mechanical computer” programmed with 48-month leap year cycle that allowed the calendar to be adjusted forward and back without issue, all from the crown. The Quantième Perpétuel à Équation of 2015 While the result is not novel, – Ulysse Nardin and H. Moser & Cie. have bi-directional perpetual calendar as well – the method certainly is. Greubel Forsey paired the mechanical computer with a similarly sophisticated in-line display – using four layers of stacked disks – making its perpetual as easy to read as it is to use. The new QP Balancier is a more focused watch than its predecessor, as it does away with the 24-second inclined tourbillon and equation of time. While wider, the case is also slimmer an...

Mario Scarpatetti Wins the F.P. Journe Young Talent Competition 2021 SJX Watches
F.P. Journe Young Talent Competition 2021 Jun 1, 2021

Mario Scarpatetti Wins the F.P. Journe Young Talent Competition 2021

Held annually since 2015, the Young Talent Competition (YTC) was established by F.P. Journe to identify and reward promising young watch- and clockmakers. Open to candidates between 18 and 30 years old from anywhere in the world, the competition is overseen by a jury made up of industry figures – including Philippe Dufour, Giulio Papi, and Francois-Paul Journe himself – with the winner receiving a certificate as well as a CHF20,000 grant to buy watchmaking tools. This year’s winner was Mario Scarpatetti, a 29-year old clockmaker from the town of Parsonz in the east of Switzerland. Mr Scarpatetti’s winning submission was the Kalendar Perpeten, a long-case pendulum clock wound by a block of marble from Mr Scarpatetti’s region. It’s equipped with a moon phase, running equation of time, and most importantly – a patented, secular perpetual calendar. Francois-Paul Journe (left) with Mario Scarpatetti The Kalendar Perpeten Mario envisioned a new type of perpetual calendar clock in 2016, as an extension of a concept he had realised in 2013 as a conventional perpetual calendar clock. A conventional perpetual calendar keeps track of the date, accounting 30- and 31-day months as well as leap years. However, such calendars still require adjustment every 100 years, as years that are divisible by 100 but not by 400 are not leap years, one of the quirks of the Gregorian calendar that is the norm today. As such, a conventional perpetual calendar will interpret the years 2...

Auction Watch: Vacheron Constantin Tour de l’Ile Grand Complication SJX Watches
Vacheron Constantin Tour de l’Ile Grand Dec 29, 2020

Auction Watch: Vacheron Constantin Tour de l’Ile Grand Complication

Taking place at the end of the third week of January 2021, the first major international watch auction is Antiquorum’s Important Modern & Vintage Timepieces in Monaco. The 304-lot auction will be capped by an appropriately major watch – the very first Vacheron Constantin Tour de l’Île Grand Complication that was produced for the watchmaker’s 250th anniversary in 2005. First sold for 1.88 million Swiss francs at the Quarter Millennium of Vacheron Constantin thematic auction staged by Antiquorum and Vacheron Constantin in April 2005, the Tour de l’Ile was one of the first mega-complications of the modern era. When the Tour de l’Ile was launched, the Patek Philippe Sky Moon Tourbillon ref. 5002 was only three years old, the Lange Tourbograph had yet to be launched, and Greubel Forsey had only been founded a year earlier. At its launch, the Tour de l’Ile was billed as the world’s most complicated wristwatch – and also became the most expensive wristwatch sold at auction – thanks to its 16 complications displayed on two faces in a case 47 mm wide and almost 18 mm tall. Named after the location of Vacheron Constantin’s workshop in the 18th and 19th centuries – Tour de l’Ile literally translates as “tower on the island” – the wristwatch is powered by the 834-component cal. 2750. It features a minute repeater, perpetual calendar with moon phase, star chart, celestial annual calendar, tourbillon, sunrise and sunset times, equation of time, power...

Vacheron Constantin Introduces the Grand Complication Split-Seconds Chronograph “Tempo” SJX Watches
Vacheron Constantin Introduces Apr 24, 2020

Vacheron Constantin Introduces the Grand Complication Split-Seconds Chronograph “Tempo”

Three years after the debut of Les Cabinotiers Celestia Astronomical Grand Complication boasting 23 complications, Vacheron Constantin has topped its own achievement at Watches & Wonders 2020 by launching Les Cabinotiers Grand Complication Split-Seconds Chronograph “Tempo”. Without going into the minefield of what counts as a complication; the new Grand Complication incorporates 24 complications, if each function counts as one – with everything displayed on a massive, two-faced case. A reversible giant In addition to showing the time, the Grand Complication includes a minute repeater, tourbillon, perpetual calendar, split-seconds chronograph as well as a number of astronomical indications including equation of time, sunrise and sunset times, plus a retrograde moon phase. The reverse face Unsurprisingly, the case is enormous – 50 mm wide and 21 mm high. But it is intriguingly designed – perfectly symmetrical in profile, the case allows the watch to be worn with either side facing up thanks to a quick-release strap. Swapping faces is a matter of unlatching the strap, flipping the watch over, and reinstalling the strap. Time, chronograph and perpetual calendar on the front; tourbillon, running Equation of Time, retrograde moon phase and times for sunrise and sunset on the back Mechanical layer cake Inside is the cal. 2756, which is derived from the cal. 2755, a movement first found in the Traditionnelle Calibre 2755 grand complication that has since been iterated ...

Breguet Introduces the Marine Tourbillon Équation Marchante 5887 SJX Watches
Breguet Introduces Mar 21, 2020

Breguet Introduces the Marine Tourbillon Équation Marchante 5887

One of the most exotic Breguet watches in production today, the Marine Tourbillon Équation Marchante 5887 combines a tourbillon regulator, perpetual calendar, and running equation of time. Complexity aside, the watch is mechanically fascinating: the traditional complications within are executed in a modern and practical way. The equation of time, for instance, relies on an open-worked cam produced via the high-tech LIGA photolithography technique. And the tourbillon cage is lightweight titanium with a silicon escapement, while the automatic winding is equipped with a peripheral rotor. Breguet has now introduced a new version of the grand complication, in pink gold with a slate-grey dial. While it is mechanically identical to the two earlier versions – in platinum with a blue dial or pink gold with a silver dial – the new watch is striking and harmonious, shedding a bit of the sports-watch aesthetic of the Marine by way of the richer colours. Being a facelift, the dimensions of the watch remain unchanged. It is still a massive 43.9 mm in width, though a svelte 11.75 mm high, thanks to the ultra-thin movement inside. Like the movement, aesthetics across the case and dial are very much a blend of new and old. The case has the traditional fluted band, but is paired with modern integrated lugs. Similarly, the dial is solid gold and decorated with traditionally-executed guilloche engraved with a rose engine, but in a modern, stylised wave motif. In a nod to the age-o...

Up Close: Jaeger-LeCoultre Gyrotourbillon 3 Meteorite SJX Watches
Jaeger-LeCoultre Gyrotourbillon 3 Meteorite Nov 27, 2019

Up Close: Jaeger-LeCoultre Gyrotourbillon 3 Meteorite

The Jaeger-LeCoultre Gyrotourbillon 3 Meteorite is a highly technical yet decorative grand complication panelled in meteorite and aventurine. But it also evokes watchmaking of the early 2000s in its mechanical grandeur. Exotic tourbillons started to proliferate at the turn of the millennium, and soon the offerings were numerous, ranging from orbital to inclined to multi-axis. Today such tourbillons are commonplace, but in the early 2000s they were radical and cutting edge. While the orbital tourbillon was nothing more than a visual spectacle, the inclined and multi-axis tourbillons were attempts to adapt Breguet’s invention for the wrist, in other words they made chronometric sense, at least on paper. One of the earliest and most significant multi-axis tourbillons was the Jaeger-LeCoultre Gyrotourbillon of 2005. While it wasn’t the first multi-axis tourbillon in a wristwatch – that honour goes to Thomas Prescher – the Gyrotourbillon was distinguished by its elaborate, three-dimensional cage of lightweight aluminium, made possible only with the aid of modern technology. The original Gyrotourbillon of 2005, which also incorporated a perpetual calendar with equation of time With the leap year and power reserve displays on the back The Gyrotourbillon was arguably the complication that defined Jaeger-LeCoultre as an haute horlogerie brand rather than a movement maker for other marques. Since its launch the Gyrotourbillon evolved into several iterations, including thi...

Highlights: Christie’s Hong Kong Watch Auction Fall 2019 SJX Watches
Audemars Piguet Jules Audemars Equation Nov 15, 2019

Highlights: Christie’s Hong Kong Watch Auction Fall 2019

After a record-setting auction weekend in Geneva, the action moves to Hong Kong in the last week of November. Chatter about the Hong Kong auctions this year are dominated by one watch, the Patek Philippe ref. 2523 twin-crown world time in pink gold with a blue enamel dial, because it carries the highest pre-sale estimate in watch auction history of 55m-110m Hong Kong dollars, or about US$7m-14m. Instead of being sold along with the rest of the watches on November 27, it will be the opening lot in the evening sale of 20th century and contemporary art on November 23. With the top lot in the evening sale – Five Nudes by Sanyu – having an estimate of HK$250m-550m dollars, or about US$32m-70m, the twin-crown world time hardly looks out of place. The Audemars Piguet Jules Audemars Equation of Time But the ref. 2523 aside, the rest of the Christie’s sale is made up of 239 more affordable timepieces, including an ultra-rare Patek Philippe ref. 3651 chronograph and a value-buy Audemars Piguet Jules Audemars Equation of Time in platinum. Here’s a look at highlights from the sale. And the full catalogue can be found here. Lot 2298 – Patek Philippe Nautilus ref. 3800/108G in white gold, with diamonds and emeralds  This is shameless 1990s bling – a Nautilus ref. 3800/108G. The suffix means it’s 18k white gold, fully set with brilliant-cut diamonds and having 11 baguette-cut emeralds for the hour markers. The watch feels weighty in the hand, though the case is compact. An...

F.P. Journe Introduces the Astronomic Souveraine Grand Complication SJX Watches
F.P. Journe Introduces Nov 14, 2019

F.P. Journe Introduces the Astronomic Souveraine Grand Complication

Just days after the F.P. Journe Astronomic Blue made for Only Watch 2019 sold for a record 1.8m Swiss francs, the watchmaker has unveiled the regular production version of the same – the Astronomic Souveraine. While the last unique F.P. Journe produced for Only Watch eventually made into production in a significantly different form, the Astronomic Souveraine is largely the same. Save for the steel case, dial colours, and movement decoration, the Astronomic Souveraine is identical to the unique Only Watch creation. Inspired by a pocket watch Francois-Paul Journe produced in 1987 – itself inspired by the earlier works of Breguet and George Daniels – the Astronomic Souveraine has 18 complications, shown on two faces on each side of the case. These include showing both mean solar time and sidereal time, as well as an annual calendar, equation of time, tourbillon with remontoir d’egalite constant force mechanism, and a minute repeater. Despite its complexity, the indications are remarkably well-presented, and furthermore, can all be adjusted via a single crown. Though the case is 44mm wide – the largest wristwatch ever by F.P. Journe – it remains notably compact at just 13.8mm high, helped in part by his ultra-thin minute repeater mechanism with flat hammers and gongs. As with most F.P. Journe watches, the dial on the front is solid gold, as are the bridges and plate of the movement. The 758-part cal. 1619 is equipped with double barrels, which are partly visible ...