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Results for Chronometer (COSC)

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Chronometer (COSC)

The Swiss accuracy certification at -4/+6 s/day across 15 days.

In Depth: Laboratoire de Précision SJX Watches
Omega Constellation Observatory we were Apr 9, 2026

In Depth: Laboratoire de Précision

Alongside the launch of the Omega Constellation Observatory, we were among the first members of the public granted access to the Swatch Group’s Laboratoire de Précision (LP), a new independent chronometer testing institute with facilities in Omega’s native Biel/Bienne and Villeret. The new organisation does not redefine chronometer norms, but it has developed a new acoustic certification process that is more automated and provides client brands with a richer performance data set - a unique capability that has implications beyond mere certification. Laboratoire de Précision. Image – Omega Initial thoughts The debut of the Constellation Observatory, the first watch certified by LP and the first-ever two-handed Master Chronometer, was greeted with a mixed feedback from both collectors and the press. Some found the choice to launch a chronometer without a seconds hand heretical, viewing it as a gimmick to promote LP’s new testing process. The Omega Constellation Observatory is the first watch to complete chronometer certification at LP. Regardless of how one feels about the two-handed aspect of the watch - I found the design balanced and appealing, even if the concept is a bit quirky - the launch placed a renewed focus on the way official chronometers are tested and certified. Many were confused by the claimed novelty of acoustic testing, given the universal presence of Witschi machines on watchmakers’ benches. Indeed, the method is not new. What is new is t...

Hands On: Omega Constellation Observatory SJX Watches
Omega Constellation Observatory Mar 30, 2026

Hands On: Omega Constellation Observatory

At long last, Omega has unveiled the spiritual successor to the beloved ‘Pie Pan’ Constellation, complete with its signature domed dial, observatory medallion, and ‘dog leg’ lugs, the Constellation Observatory. First teased on the wrist of actor Delroy Lindo at the Academy Awards, the Observatory debuts in an expansive range of case materials and dial treatments. The collection also marks the commercial debut of Swatch Group’s Laboratoire de Précision, which has developed a new chronometer testing process capable of certifying two-handed watches. As a result, the Observatory carries the unexpected distinction of being the first Master Chronometer that displays only the hours and minutes. The Observatory in 18k Sedna gold, the brand’s trade name for its proprietary rose gold alloy. Initial thoughts The Observatory embodies Omega’s strengths, capitalising on the brand’s historical pedigree and proprietary materials and technologies, including its own durable alloys and the co-axial escapement. The Observatory in steel. On the other hand, the Observatory suffers somewhat on account of its thickness, relying on a movement platform developed at a time when the trend toward large watches appeared to have no end in sight. That said, the case design does a decent job of reducing the perceived thickness, and it looks and feels thinner than many other watches that share its dimensions on paper. It also demonstrates the immense capabilities of the broader Swatch Grou...

Hands On: Christopher Ward C63 Sealander True GMT SJX Watches
Christopher Ward C63 Sealander True GMT Mar 19, 2026

Hands On: Christopher Ward C63 Sealander True GMT

The Christopher Ward C63 Sealander True GMT fills a conspicuous gap in the brand’s catalogue with a proper ‘flyer’ GMT, complete with an independently adjustable local-time hour hand. A handsome, expensive-looking dial conceals the new CW-002 movement, which is COSC-certified and offers a five-day power reserve - a rare pairing. While collectors have noticed that Christopher Ward’s pricing has risen steadily in recent years, the True GMT makes a compelling case that the technical substance has kept pace. The journeyman brand Christopher Ward (CW) is a brand that is evolving unusually rapidly, and seems to have been in a state of almost constant transformation since it was founded in 2004. The brand has cycled through a number of different logos in a fairly short period of time, which has confused collectors. The product mix has also shifted, reflecting more upmarket ambitions that have priced out fans of the brand’s early budget products. This instability has turned off some collectors, which is understandable - most luxury brands are fairly conservative, in part to emphasise the long-lasting social capital that comes with a purchase. That said, CW seems to have finally found an identity worth sticking to. The new logo, which combines England’s St. George’s Cross and the white cross of the Swiss flag, is simple and appealing, and concisely communicates the English/Swiss origin. And while it’s true that prices have crept up, the brand has increased innov...

Meistersinger Introduces the Archao Worn & Wound
MeisterSinger Feb 17, 2026

Meistersinger Introduces the Archao

The one handed watch is a curious thing. On the face of it, it seems illogical. On a mechanical watch, stripping away a more precise minute hand in favor of a single hour hand negates one of the things enthusiasts covet most: precision. Or, at least, the relative precision. Things like COSC certification and the hard work and ingenuity that go into making mechanical movements become secondary when you pull back sufficiently far from an ability to clock the time to the exact second (indeed, the COSC will not certify any watch without a seconds hand).  But removing that hand is additive, as well. It forces the designer of a watch to think very critically about how that hand is going to tell the time, and the thing that actually defines one handed watches is not so much the fact that they only have a single hand, but the way in which that hand interacts with any timing markers on the dial. There are different approaches, of course. Avant-garde designs might strip out markers altogether, so that a dial’s texture or material can be the singular focus of a piece. This, to me, feels like the most jewelry oriented option possible. Another approach, and the one most often favored by Meistersinger, a brand known primarily for their one handed watches, is to focus like a laser on readability at a glance, designing markers and indices that are large enough and graduated to a degree that makes it relatively easy to get the precise time at a glance. I often think about the time I spe...

Affordable Vintage: the Longines Grand Prize Worn & Wound
Longines Grand Prize Longines Feb 4, 2026

Affordable Vintage: the Longines Grand Prize

Longines is a storied and well-respected Swiss watch manufacture that formed in 1832 and has continued uninterrupted to this day. From the first wrist chronometer in 1911, to groundbreaking flyback chronographs in the 1930s, to the world’s first hi-beat wrist chronometer in 1959, Longines holds their own in the watchmaking world.  My favorite period for watches is the 1950s through the 1970s and Longines was one of the top accessible brands during that time. In 1954 Longines began a marketing strategy of product families, launching the Conquest line of watches. In 1957 they introduced the Flagship line, adding to what would become a large group of watch families, many of which are still made today. Other lines that came later include the Admiral, the Ultra-Chron and the Grand Prize. The Grand Prize line was named in honor of the multitude of watchmaking awards and honors that Longines had accumulated over the decades. It was a relatively short-lived family, produced from about 1958 to 1964 according to my research. I have found that the majority of Longines watches produced during these decades were all fairly equal in quality and craftsmanship, with most of the differences in the families being design related. The Conquests were rugged and sporty, on par with the early non-diver Omega Seamaster watches. The Flagship series were dress watches, while the Admiral line was a mixture of both. The Grand Prize family were pretty much all thin, elegant everyday type dressier w...

Albishorn’s Type 10 Officer Takes Flight SJX Watches
Dec 15, 2025

Albishorn’s Type 10 Officer Takes Flight

The Albishorn Type 10 Officer is the latest expression of the brand’s “imaginary vintage” philosophy, reworking the familiar codes of the mid-century military chronograph through the lens of a hypothetical Type 20 predecessor. Conceived by founder Dr Sébastien Chaulmontet, the cream-dialled Officer pairs its distinctive, parchment-like textured dial with a proprietary monopusher movement derived from a re-engineered Valjoux 7750 architecture, combining COSC-certified performance with thoughtful ergonomic and aesthetic refinements at a price that undercuts many conventional aviation-inspired chronographs. Initial thoughts Military aviation-inspired watches are a cornerstone of the luxury watch market, but most pay homage to specific historical references like the famed Type 20 of the 1950s. In contrast, the Albishorn Type 10 proposes to ‘recreate’ a hypothetical Type 20 predecessor. The cream-dialled Officer takes this idea further, suggesting a “missing link” is the aesthetic development of the military chronograph, with a lighter-coloured dial for open-air usage away from the front lines. When the Type 10 debuted with black and green dials, I was a bit skeptical of the texture, which reminded me of asphalt. The Officer’s dial features a similar texture, but the off-white colour transforms the look. To my eye, the new dial looks like vintage German etching paper, which is an appealing texture that suits the theme of the watch. Inside, the Officer is as com...

Hands On: Chopard L.U.C. Grand Strike SJX Watches
Chopard L.U.C Grand Strike Dec 11, 2025

Hands On: Chopard L.U.C. Grand Strike

The 30th anniversary of the Chopard L.U.C. manufacture was one anniversary among many this year, but it will likely be remembered thanks to the Grand Strike, the most complicated watch in Chopard’s history and its first grande sonnerie. Building on the successful Full Strike minute repeater architecture and making full use of the brand’s patented sapphire gongs, the Grand Strike is a chronometer-certified two-train clock watch with a push-button minute repeater. In this context, the presence of the tourbillon is almost a footnote. Initial thoughts I can count on one hand the number of brands that have created their own grande sonnerie wristwatch. It’s one of the few things in watchmaking that’s proven challenging enough to still be rare, even in the days of computer-aided design (CAD) and advanced manufacturing technology like wire erosion. For this reason, the grande sonnerie has a towering cultural presence among watchmakers and collectors, looming above all other complications. For Chopard, the Grand Strike represents the culmination of 30 years of the L.U.C. manufacture, the brand’s haute horlogerie division. The first impression of the Grand Strike is one of extraordinary depth. There’s not much of a dial, save for the minutes scale etched on the inside of the sapphire crystal, and the small concentric sub-dials for the dual power reserve displays. This depth shrinks the watch visually, and it feels dense and compact despite its rather large 43 mm size and...

In-Depth: Breguet’s Constant-Force Magnetic Escapement SJX Watches
Breguet s Constant-Force Magnetic Escapement Dec 4, 2025

In-Depth: Breguet’s Constant-Force Magnetic Escapement

Earlier this week, Breguet rounded off its grandiose 250th anniversary with the unexpected launch of the Expérimentale 1 chronometer in Paris. Showcasing modern Breguet’s most impressive innovation to date - a magnetic constant-force escapement - the watch left many scratching their heads simply because the novel invention defies easy explanation. Here we explain the actual functioning of this remarkable invention, and why it represents such a significant step forward in terms of chronometry and escapement technology. The origins of the concept Before turning to the decidedly modern and futuristic Expérimentale 1, we must first take a short trip to the past and consider how the idea of using magnets in mechanical escapements first came to life. For that we must turn to the late 1930s, when Cecil Frank Clifford, Fellow of the British Horological Institute (BHI), started experimenting with oscillators maintained by magnetic rails or escape wheels.  He was granted a British patent in 1954 for a variety of magnetised escape wheels paired with elastic vibrating magnetic blades. The device would operate silently and Clifford envisioned it being used for naval underwater torpedoes, so the lack of ticking would be harder to pick up by sonars.  Iterations of Clifford magnetic escapements. His designs were rudimentary. The principle was that the escape wheel would be braked by a vibrating pair of magnetised blades (in several possible configurations), while simultaneously ...

Breguet’s Magnificent Magnetic Expérimentale 1 SJX Watches
Breguet s Magnificent Magnetic Expérimentale Dec 1, 2025

Breguet’s Magnificent Magnetic Expérimentale 1

Breguet concludes its 250th anniversary with the brand’s most forward-thinking watch, the Expérimentale 1 that boasts a magnetic, true constant force escapement. Equipped with a frictionless escape wheel and pallet lever driven by magnetic forces, the movement runs at 72,000 beats per hour, or 10 Hz – arguably making the Expérimentale 1 the ultimate Breguet chronometer. Impressively innovative with its use of silicon, magnets, and clever teeth geometry, the limited edition watch also marks the start of the Expérimentale line, a collection that will serve as a platform to debut new complications, technology, and designs. Initial thoughts While some might have been expecting an updated Sympathique, Breguet instead surprised with perhaps the most advanced wrist-borne mechanical chronometer in modern watchmaking. Taking cues from Abraham-Louis Breguet’s own “constant force” escapements, Breguet today harnessed the power of permanent magnets and unique teeth geometry to built a genuinely friction-less, constant torque escapement. In fact, the new escapement appears to be the only truly frictionless and constant force escapement on the market today.  Magnets have been employed in escapements in the past, but this approach was historically unreliable. Breguet appears to have discovered the right formula for a magnetic escapement. Several functioning prototypes were on show at the launch event. Moreover, Breguet chief executive Gregory Kissling explained that the ma...

Highlights: Pocket Watches at Phillips Hong Kong SJX Watches
Patek Philippe Nov 14, 2025

Highlights: Pocket Watches at Phillips Hong Kong

The upcoming Phillips Hong Kong auction includes a diverse and spectacular selection of pocket watches spanning two centuries. From early 19th‑century enamel masterpieces crafted for the Chinese market to 20th‑century tourbillon chronometers that triumphed at observatory trials, the lots on offer demonstrate the technical and aesthetic evolution of the watch over the last two hundred years. Lot 1086 – S. Smith and Son No. 1899-1 Tourbillon Chronometer with Kew Class A Certificate Albert Pellaton-Favre constructed the first of two tourbillons in the auction, which was later retailed by S. Smith & Son. The other, by Patek Philippe, is the work of his son, Jämes-César Pellaton. Both are depicted in Reinhard Meis’s famous Das Tourbillon. The English and Swiss disagreed on what constitutes a chronometer. The English argued that a chronometer must use a chronometer (detent) escapement, while the Swiss considered any watch a chronometer if performed well enough – which the English would call a “Half-Chronometer”. As the Willis enamel dial boasts, the first is a chronometer by both English and Swiss reckoning, with a spring detent escapement and “Especially Good” certificate from the Kew Observatory. While S. Smith and Son retailed quite a number of tourbillons, including others with detent escapements, most were sourced locally, while the present lot uses a Swiss movement. The London branch of Baume Frères ordered six tourbillon chronometers from Albert Pella...

The Greatest Horological Masterpieces of All Time: the Harrison H4 – A Groundbreaking Timepiece That Solved The Longitude Problem Worn & Wound
Oct 27, 2025

The Greatest Horological Masterpieces of All Time: the Harrison H4 – A Groundbreaking Timepiece That Solved The Longitude Problem

A series of features identifying the most extraordinary mechanical masterpieces in history, blending precision, innovation, and craftsmanship. We all have our favourite timepieces either in our collection or those incredible horological masterpieces that have been invented or created through the ages. This series will showcase examples from the previous centuries up to the present day and look at the importance and impact on modern day timekeeping.  John Harrison’s H4 Chronometer was a groundbreaking timepiece that solved the longitude problem, a major challenge for navigation during the 18th century. Before Harrison’s work, sailors had no reliable way to determine their precise east-west position at sea, leading to deadly navigation errors. The British government, through the Longitude Act of 1714, offered a large prize to anyone who could develop a practical solution. Sir Cloudesley Shovell, by Michael Dahl, about 1702-5 (L); The Association with the Eagle, Rumney and the Firebrand, Lost on the Rocks of Scilly, October 22, 1707 (R). Image courtesy of the © National Maritime Museum, Greenwich, London The Catalyst for the Longitude Act In the early 18th century, determining longitude at sea was one of the greatest challenges in navigation. While sailors could measure latitude using the position of the sun or stars, longitude required precise timekeeping-something that was nearly impossible with the unreliable clocks of the time. The inability to determ...

Introducing – Formex Dresses its Bestseller in Full-Ceramic with the New Essence Ceramica Monochrome
Formex Dresses Sep 25, 2025

Introducing – Formex Dresses its Bestseller in Full-Ceramic with the New Essence Ceramica

Formex, founded in 2000, is renowned for its rugged action watches. The brand’s bestselling Essence, a sporty, all-terrain model with sharp case architecture, a patented suspension system, and COSC-certified movements, made its debut in 2018 and was refreshed in 2021 with a wider range of dial colours. Marking its 25th anniversary, Formex released its first […]

Hands-On With The New Lederer CIC 39 Longitude Fratello
Sep 19, 2025

Hands-On With The New Lederer CIC 39 Longitude

Just one year ago, I was introduced to Lederer watches. The brand, founded by Bernhard Lederer, creates incredible movements with complex mechanisms. Constant-force escapements and twin gear trains are some of the impressive details. Last year, I fell in love with the Triple Certified Observatory Chronometer, a set of 44mm watches that had traveled to […] Visit Hands-On With The New Lederer CIC 39 Longitude to read the full article.

In-Depth: Ferdinand Berthoud Tests the Limits of ‘Hand Made’ SJX Watches
Chopard Sep 4, 2025

In-Depth: Ferdinand Berthoud Tests the Limits of ‘Hand Made’

Few brands approach marine chronometer-style wristwatches with the intensity of Ferdinand Berthoud (FB). Fewer still have the capacity to produce a watch that is truly hand made. The brand has leaned into these strengths to good effect with the Naissance d’une Montre 3, which is perhaps the most labour-intensive wristwatch ever created. Marking the third official chapter of the Time Æon Foundation’s Naissance d’une Montre project, the Montre 3 is the byproduct of a six year quest to thoroughly document the steps required to make a chain and fusee wristwatch using only hand-operated tools. While the production of the Montre 3 involves more than 80 individuals from both FB and its parent Chopard, the labour involved equates to roughly a full year’s work for five people to produce each of the 11 pieces that will be made in the coming years. Initial thoughts It’s easy to feel jaded about the smoke and mirrors of luxury watch marketing, with terms like ‘hand made’ and ‘in-house’ used all too freely, making it difficult to separate the signal from the noise. Make no mistake, the Montre 3 is, in some ways, what all traditional haute horlogerie watches aspire to be, and takes the concept of hand craftsmanship to its absolute limit. The Montre 3 is neither inventive nor complicated, but the intrinsic quality of its construction is immediately obvious and breathtaking in its own right. To some extent, the simplicity of the 44.3 mm white gold case demonstrates the ...

The 15 Best British Watch Brands (2026) Teddy Baldassarre
Aug 18, 2025

The 15 Best British Watch Brands (2026)

While Switzerland is regarded today as the world leader of watchmaking, Great Britain can lay claim to a wealth of horological milestones throughout its history as well. From Thomas Mudge’s development of the lever escapement in 1755 to John Harrison’s invention of the marine chronometer in 1759 to the innovations of clockmaker Thomas Tompion and his protegé George Graham in the areas of science and astronomy, England was an undisputed leader in timekeeping throughout the 18th and 19th centuries. The 20th century brought the decline of the British Empire and, with it, British watchmaking, as nations like Switzerland, Germany, and (for a while) the United States stepped in with modern mass-production techniques while the Brits held fast to traditional, artisanal methods. The United Kingdom essentially ceased being a major producer of timepieces by the end of World War II, but as the 21st Century dawned, a handful of entrepreneurial Britons have made great strides in bringing high-end watchmaking back to their native land, establishing new brands - and in some cases, resurrecting old ones - to make watches that appeal to today’s discerning enthusiasts in the U.K. and across the world. Whether the focus is military-style tool watches, avant-garde complications at approachable prices, or ultra-high-end pieces for well-heeled collectors, each brand boasts an identity that is proudly British and at the same time distinct from its peers. Here are 15 British watch bran...

Voutilainen Realises a Collector’s Dream, the 28 Kohan SJX Watches
Vacheron Constantin Jul 17, 2025

Voutilainen Realises a Collector’s Dream, the 28 Kohan

Voutilainen recently completed a custom commission with the 28 Kohan, a one-off example of its signature chronometer wristwatch that blends Finnish cultural symbols with Japanese decorative arts. Much of the decoration on the watch is maki-e, traditional Japanese lacquer, that is the work of artisan Tatsuo Kitamura, a frequent collaborator who was also responsible for past Voutilainen maki-e timepieces. Initial Thoughts Unique pieces and commissioned watches were historically the norm at the highest end of the watch market, which was then much smaller. Clients could be more demanding, and for the watchmaker, the risk of being unable to find a buyer was very real. Today off-the-rack watches dominate, largely for commercial and production reasons. Even brands with a long history of bespoke or custom watchmaking eschew custom dial colours. Some, however, keep the practice alive, like Vacheron Constantin with its Les Cabinotiers. Many independents also remain amenable to customisation, even established names that no longer need to, like Voutilainen, albeit with a long wait. Bespoke watches are inherently difficult to criticise – such watches are a success as long as the commissioner is satisfied, even if it’s the most hideous thing ever. Fortunately that isn’t the case here, the adjective that comes to mind is bedazzling. I suspect maximalist designs are often common on Voutilainen’s custom watches because collectors want to make the most of the opportunity. Some deta...

Introducing – The new IWC Portugieser Tourbillon Retrograde Chronograph in Armor Gold Monochrome
IWC Portugieser Tourbillon Retrograde Chronograph Jul 7, 2025

Introducing – The new IWC Portugieser Tourbillon Retrograde Chronograph in Armor Gold

The Portugieser line is one of IWC’s iconic collections, tracing its origins back to the late 1930s when Portuguese businessmen sought precision marine chronometer-grade wristwatches with oversized cases and clear dials. Since then, the Portugieser family has evolved into a flagship line balancing classic elegance with technical prowess, blending clean, legible design with complications that […]

In-Depth – The New Chopard L.U.C Qualité Fleurier 20th Anniversary Edition Monochrome
Chopard L.U.C Qualité Fleurier 20th Jun 27, 2025

In-Depth – The New Chopard L.U.C Qualité Fleurier 20th Anniversary Edition

In the world of fine watchmaking, certifications have always played a reassuring role for clients regarding the quality of their beloved watches. Of course, COSC, the standard for chronometric certification, which is primarily focused on the precision of the watch, is the first to come to mind. But many other initiatives have surfaced over the years. […]

Introducing – The Arnold & Son Perpetual Moon 41.5 Red Gold Cliff Grey Edition Monochrome
Arnold & Son Jun 27, 2025

Introducing – The Arnold & Son Perpetual Moon 41.5 Red Gold Cliff Grey Edition

Swiss watchmaker Arnold & Son is named after the 18th-century English watchmaker John Arnold, the ingenious inventor who popularised the expression ‘chronometer’ to describe his precision marine timekeepers. Before the advent of marine chronometers to determine longitude at sea, navigators relied on the position of the Sun, Moon and stars to determine their position. Astronomy, […]