Perpetual Calendar

Reference Points: The Patek Philippe Split-Seconds Wristwatch

You could make the argument that, among all brands, models, and complications, the Patek Philippe split-seconds wristwatch is one of the most overlooked, underappreciated, and least understood in any catalog. "That's because no one ever sees them," said Ben, when I made that very argument in the office recently. True. It's hard to call a watch underappreciated when the entry point for buying one is in the low six figures. But let me explain. The Patek Philippe ref. 5373. Think about this: the first chronograph wristwatch Patek ever made was a split-seconds. The first. Oh, and it was the first made by any brand. And while people are clamoring for perpetual calendar references like the 2497, 3448, and 3940, Patek has made at least 44 different perpetual calendar wristwatch models over the years (not counting different case materials, gems, or the 3971). How many serially-produced split-seconds references? Well, about 12 or 13, depending on how you count them.  It wasn't until recently that the reference 5004—the first modern serially produced perpetual calendar split-second watch from Patek—began to receive its due at auction, and it finally broke a 13-year-old record for the reference. A 1436, the first serially produced rattrapante, can still be had for less than an F.P. Journe Chronomètre Bleu. That, frankly, is ridiculous. They're rare birds, and it's all the more impressive that we have nine of them on the table today, all from the same owner. The Patek Philippe r...

Hands On: Rolex Submariner Date Desk Clock Ref. 909010LN

Late last year, Rolex unveiled its accessories line, comprised of a range of cufflinks and the Submariner Date Desk Clock ref. 909010LN. In the typical Rolex fashion, the new accessories are conservatively styled; the desk clock is essentially a Submariner face enlarged to 80 mm. But in typical Rolex fashion, the clock is impressively made. The Submariner desk clock is an impressive piece of desk-bound timekeeping. Execution is top class with flawless fit and finish, while the mechanics (or more accurately, electronics) are advanced: the quartz movement incorporates a 400-year perpetual calendar, and surprisingly, decorative finishing. Initial thoughts The Submariner desk clock is an impressive object, sizeable, heavy, and clearly well made. It has to be seen – and held – in person to understand the quality of make. Elements like the brushed steel case (that’s ironically not water resistant), engraved bezel insert, and decorated movement speak to the precision manufacturing and finishing. This clock is a beautifully-made industrial creation. That said, the design is a boring. It’s basically a Submariner face blown up to 80 mm. Fans of the design will be pleased as Rolex did replicate the details of the wristwatch artfully, right down to the engraved flange around the dial and tiny crown within “Swiss made”. Fortunately, the insides of the clock are more advanced than the design. The cal. 8335 displays the time and date, but the date is actually a secular calend...

Hands-On: The Haim Watch Co. Annum

Haim Watch Company, a Chicago-based microbrand, marked its fifth anniversary in 2025 by introducing an intriguing new timepiece called the Annum. I first saw the watch last fall at the WindUp Watch Fair in New York City, where the brand's founder, M. Zakir Miah, brought along a prototype that immediately caught my attention. Visitors at the event received a sneak peek of the Annum alongside previous creations like the Viajero worldtimer, a model I reviewed last year. Since that initial preview, the Annum has undergone a bit of an evolution, including a subtly redesigned case and a few small tweaks to the dial. In its final iteration, the Annum offers a compelling complete calendar watch that punches well above its weight and continues what Haim Watch Company has achieved with its Viajero: creative, supremely wearable takes on complications that stand out the price point. The Annum comes in three dial variations. "Dark Cobalt" and "Stone White" are solid-colored dials with a sunken-in CNC guilloché center section and applied hour markers on the grained outer dial ring. But when it was time to pick which variant I'd spend some time with for this hands-on, it was the semi-transparent "Fumée" dial that I wanted to see, and it wasn't even close. From afar, the Fumée iteration reminds me of the dials of great skeletonized perpetual calendars of old, thanks to the display of the module underneath the smoked PVC (plastic) dial. On this dial, the subdial rings and minutes track ...

Hands-on - The Patek Philippe Annual Calendar 5396R-016, Celebrating 30 Years of an Ingenious Complication

Introduced in 1996 with the reference 5035, Patek Philippe’s Annual Calendar was neither a simplified perpetual calendar nor an upgraded complete calendar, but an entirely new mechanism protected by a patent; we explained the full story of its creation and evolution in this article here. By automatically distinguishing between months with 30 and 31 days, […]

In-Depth: IWC’s Pioneering ProSet Perpetual Calendar

IWC’s history is dotted with landmark innovations such as Albert Pellaton’s pawl winding system, Kurt Klaus’ famous perpetual calendar, and Richard Habring’s split-seconds chronograph module; the ProSet perpetual calendar system continues this legacy. This bidirectional perpetual calendar module made its debut earlier this year at Watches & Wonders inside the Big Pilot’s Watch Perpetual Calendar ProSet, and remains true to IWC’s identity as an engineer’s manufacture. A smaller Big Pilot QP The Big Pilot ProSet unveiled at Watches & Wonders blends the manufacture’s latest engineering feat with the beloved styling of the pilot’s watch. The ProSet system is currently only available inside the 42 mm Big Pilot. Powered by a downsized base calibre, the 42 mm ProSet is the first Big Pilot under 46 mm to include a perpetual calendar. IWC has a tweaked and scaled down the its signature Kurt Klaus module in the past for the 42 mm Portugieser and some Portofinos, but somehow it never made into the reduced Big Pilot collection. Unfortunately, these smaller watches lacked the now-iconic digital year display, and instead featured a subtler (but more forgettable) leap cycle aperture. The ProSet brings back the four-digit year display, making this watch almost indistinguishable from the original 46 mm version. Apart from some styling choices, the main difference in the displays is the lack of a power reserve indicator. The cal. 82665 inside is powered by a single mains...

In-Depth: IWC’s ProSet Perpetual Calendar

IWC’s history was dotted with landmark innovations such as Albert Pellaton’s pawl winding system, Kurt Klaus’ famous perpetual calendar, and Richard Habring’s split-seconds chronograph module. Though IWC has arguably been thin on such innovation in recent years, the ProSet perpetual calendar is a long overdue return to form. The calendar’s clever features make it true to IWC’s identity as an engineer’s manufacture. Set entirely via the crown just like the Kurt Klaus calendar, ProSet can also be adjusted forwards and backwards, making it both idiot-proof and convenient. A smaller Big Pilot This bidirectional perpetual calendar module made its debut earlier this year at Watches & Wonders inside the Big Pilot’s Watch Perpetual Calendar ProSet, which blends the manufacture’s latest engineering feat with the beloved styling of the pilot’s watch. The ProSet system is currently only available inside the 42 mm Big Pilot. Powered by a downsized base calibre, the 42 mm ProSet is the first Big Pilot under 46 mm to include a perpetual calendar. IWC has a tweaked and scaled down the its signature Kurt Klaus module in the past for the 42 mm Portugieser and some Portofinos, but somehow it never made into the reduced Big Pilot collection. Unfortunately, these smaller watches lacked the now-iconic digital year display, and instead featured a subtler (but more forgettable) leap cycle aperture. The ProSet brings back the four-digit year display, making this watch almost ...

Hands-On: The Vacheron Constantin 'Twin Beat' Perpetual Calendar Returns

When Vacheron Constantin announced the original Twin-Beat at SIHH in 2019, I wasn't in the watch space in the same way I am now. I was also focused on a much different price point—the one I shop in, not the one that I've since become fascinated by. So I missed it. A lot of people did, it seems. I don't think this watch, as interesting as it is/was as a first release, was made in particularly large numbers, and for over a year, I heard rumblings about the eventual return of the Twin-Beat. Well, it's here. It's improved. And yes, in the metal, it's both entertaining and impressive. But what is it? Essentially, the watch leverages two balances that beat at different rates to provide either 4 days of power reserve running at 5Hz or 70 days in standby mode at 1.2Hz. Oh, and it's a perpetual calendar as well. We covered the technical aspects back in 2019, so this will focus more on the watch as a revived model. The technical is the key here, but the form factor is impressive as well. A perpetual calendar, with dual balances, measuring 42mm and 12.3mm thick, it's hefty because of the platinum case, but it wears quite well despite the technicality. Vacheron has a tendency to make some impressively complicated watches and, unfortunately, make them quite large in the process. This would never have been a problem in the old days (especially for brands like Patek, which dominated this high-end, integrated complication space), but then again, the specifications of the old days don't ...

Hands On: A. Lange & Söhne Lange 1 Tourbillon Perpetual Calendar “Lumen”

A. Lange & Söhne’s flagship launch for the year, so far, is the Lange 1 Tourbillon Perpetual Calendar “Lumen”. It follows a familiar template, applying the desirable “Lumen” treatment to a complicated, top-of-the-line model. But unlike earlier Lumen editions, the Lange 1 Tourbillon Perpetual Calendar is more than a mere cosmetic makeover. The unique calendar display requires a more complex dial construction, and the movement has been reworked for visual impact. Even though the concept is predictable – and predictably pricey – the Lange 1 Tourbillon Perpetual Calendar “Lumen” is unexpectedly appealing. Initial thoughts This is stating the obvious, but the Lange 1 Tourbillon Perpetual Calendar “Lumen” is clearly the most appealing iteration of the most complicated Lange 1. Visually it is more striking in both light and darkness, with the new look also adding to the intricacy of the dial construction. And because Lange doesn’t do things in half measures when it comes to movements, the L225.1 inside this has been reworked by some margin to solve one of the shortcomings of the original model, a tourbillon that was barely visible. The original Lange 1 Tourbillon Perpetual Calendar was and still is the most complicated version of Lange’s iconic watch design. All perpetual calendar indicators were cleverly incorporated in the Lange 1’s distinctive yet sensible layout. Add to that a tourbillon visible only on the back meant there was a lot going on ins...

Introducing - The Bulgari Octo Finissimo Perpetual Calendar Now Comes in Blue Titanium

When Bulgari launched the Octo Finissimo Perpetual Calendar in 2021, it did what the Octo Finissimo line has done repeatedly over the past decade. It broke another record. At just 5.80mm thick, it became the world’s thinnest perpetual calendar wristwatch, a title it still holds today. Since then, we have seen it in its original […]

In-Depth - The Urban Jürgensen UJ-1 Tourbillon, a Pocket Watch Masterpiece Reborn for the Wrist

When Urban Jürgensen returned in 2025 under the co-direction of Kari Voutilainen and Alex Rosenfield, three watches formed the inaugural collection. The UJ-2 introduced a time-only calibre with a double-wheel natural escapement; the UJ-3, an integrated perpetual calendar; while the UJ-1 Tourbillon 250th Anniversary Watch was meant to be the technical masterpiece for the return […]

Photo Report: Watch Spotting At The Hodinkee Happy Hour [June 2026]

The third time is the charm, as we recently hosted the third edition of what's quickly becoming a regular fixture on the calendar—Hodinkee Happy Hour. Grotta, our local watering hole, was the venue this time around, and the room delivered the same energy as always. Great conversations, great company, and no shortage of great watches to look at—a few of which you'll see below. If you made it out, thank you for coming. If not, we'll be doing it again at the end of July. Follow us on Instagram to be the first to know when RSVPs open.  Blancpain Léman Perpetual Calendar Flyback Chronograph A Cartier Tank Basculante in it's natural form... ... and in motion. Alex Chou wearing his A. Lange & Söhne Lange 1. Katie Penner, of Watches of Switzerland, and Hodinkee Video Editor Max Rosen. A trio of Ressence. A look at a F.P. Journe Chronomètre Souverain (on bracelet, no less) from the front... ... and the back. Vertex M36 Desert Edition. A little two-tone love for the Zenith Chronomaster Sport... And Rolex Datejust. Rolex Submariner. Rolex Cosmograph "Alcaraz" Daytona on an Oysterflex bracelet. Vacheron Contantin 333. A Swiss "Chronographe Suisse" Chonograph... (Swiss, chronograph, Swiss, chronograph, swiss...) Omega Seamaster De Ville and a good ol' pie-pan Omega Seamaster. Panerai Luminor Marina. Right, Editor-in-Chief James Stacey is wearing his DWC Terra. Urwerk UR-120.

The Vacheron Constantin Overseas Self-Winding 34.5mm gets a colourful new duo

Vacheron Constantin's new Overseas Self-Winding 34.5mm models debut colour palettes introduced to the perpetual calendar last year.

First Look - The New IWC Portugieser Yacht Club Perpetual Calendar 42

Ever since Kurt Klaus developed his ingenious perpetual calendar mechanism in the early 1980s, the Schaffhausen-based manufacture has made one of watchmaking’s most sophisticated complications surprisingly easy to live with. Yet despite appearing across several generations of Portugieser, the perpetual calendar had never found its way into the collection’s sportiest member. Perhaps for a reason, […]

Introducing: Split Watches Comes To The U.S. With Its New GMT (Live Pics)

What We Know If you haven't heard of the brand Split before, you're likely not alone. The brand has not previously been distributed in the U.S., but it came to my attention when their chronograph, called "In The Skies," launched with a fully luminous case made from a proprietary ceramic-and-polymer fusion called Ceramod+. At $2,053, it was an interesting and fun novelty, and cheaper than the IWC Ceralume Perpetual Calendar (though a vastly different proposition, to be fair). Now that material, sans lumen, is coming to the United States with a new, relatively affordable GMT. But the watches are only a small part of the story for Split. The brand was co-founded by Edward Margulies, the third generation of a prominent family of UK-based Swiss watch distributors. His father, Marcus Margulies, might be known to some as the collector behind one of the most impressive collections of Audemars Piguet watches in history, which formed the basis for much of the AP museum. Edward moved to Switzerland at the age of 19 to train to follow in his footsteps.  While the press release talks about how he spent his life putting on a smile to hide a frown caused by burying trauma for years, his interview in the New York Times reveals something deeper. The reality is that, after decades of struggling with his mental health and taking traditional paths of therapy and antidepressants, his physical health had deteriorated, and he was prescribed fentanyl. "Next thing I know," he said to the New York...

Hands-On With A. Lange & Sohne’s 1815 Rattrapante Perpetual Calendar Pink Gold

A. Lange & Söhne’s 1815 Rattrapante Perpetual Calendar brings together high complications, vintage-inspired design and a stunning pink-gold dial in one deeply romantic expression of haute horlogerie! What We Love Traditional pocket watch inspired vintage case design Pink gold dial suits this model perfectly and captures it in the best light Two romantic high-complications of rattrapante and perpetual calendar are showcased beautifully What We Don’t No lume for low-light legibility The case thickness may be large for some This classic pocket-watch inspired design may not be practical for daily wear Overall Rating: 9.4 / 10 Value for Money: 9.5/10 Wearability: 9/10 Design: 9.5/10 Build Quality: 9.5/10 The A. Lange & Söhne 1815 Rattrapante Perpetual Calendar is one of those timepieces that immediately reminds you why the Saxon manufacture is held in such high regard. It brings together so much of what makes German watchmaking special, but does so in a way that leaves you genuinely in awe. I recently did a video on this watch, sharing my thoughts on what makes it so special, and my opinion still has not changed: this is easily one of my top three favourite models from the brand. But enough of me drooling over it, let’s get into what makes this timepiece so remarkable. The A. Lange & Söhne 1815 Rattrapante Perpetual Calendar was first introduced in 2013 as a milestone in Lange’s modern chronograph history. As the name suggests, the timepiece brings together a rat...

The Vacheron Constantin Traditionnelle Twin Beat Perpetual Calendar Returns With A 70-Day Power Reserve

Vacheron Constantin continues its quest to revolutionize the perpetual calendar complication with the 2026-upgraded Traditionnelle Twin Beat Perpetual Calendar. The revolutionary aspect here lies in its power reserve, which can last up to 70 days. This is not a novelty but a continuation of the efforts made for the 2019 GPHG Innovation Prize winner, which […] Visit The Vacheron Constantin Traditionnelle Twin Beat Perpetual Calendar Returns With A 70-Day Power Reserve to read the full article.

The Citizen AQ4094-58L Is a Stealth Perpetual Calendar in Indigo Washi

A 400-piece limited edition of The Citizen with an Eco-Drive perpetual calendar, Super Titanium case, and indigo washi dial. Here's what stands out.

First Look - The New Bovet Récital 31, a Very Intuitive Perpetual Calendar

The perpetual calendar is one of the most fascinating watchmaking complications. It can also be one of the most frustrating. Capable of automatically accounting for irregular month lengths and leap years, it is a mechanical marvel, yet one that often requires patience and caution when adjustments are necessary. With the new Récital 31, Bovet joins […]

Introducing: Citizen's New "The Citizen" And Attesa Recrystalized Titanium Limited Edition Eco-Drives

What We Know Citizen recently announced two new limited-edition models as part of its celebration of the 50th Anniversary of its light-powered Eco-Drive movements. For those not in the know, Eco-Drive relies on any light source—not just solar—to power the movement and build a pretty impressive power reserve (in most cases). That adage holds true for the watches that they released most recently. Let's start with the one that will probably resonate the most with our audience: the new limited-edition version of "The Citizen." Limited to only 400 pieces, the watch features a relatively classic case design, measuring 40mm by 12.2mm, with the brand's proprietary Super Titanium case treated with Duratect Platinum. This is capped by what the brand calls its deep indigo-blue Tosa washi paper dial, with gold-colored (not true gold) accents on the applied indices and date surround. Washi paper, a special type of Japanese mulberry paper, was hand-dyed using natural lye fermentation to create a deep indigo color while preserving the paper's texture. More specifically, the color, called Kachi-iro, is a deep shade of indigo that is traditionally considered lucky because it is pronounced in the same way as the word for "victory color." Inside the case is the Cal. A060 Eco-Drive movement. When fully powered up, it has 18 months of power when in power-save mode. In addition to hours, minutes, and seconds (and hands and indices with lume), the movement has a clever perpetual calendar set...

Vacheron Constantin Brings Back the Traditionelle Twin Beat Perpetual Calendar

What is the ultimate first world problem? I can think of a handful. There’s the classic notion that we just have too much content to scroll through, stream, and consume. As the Boss put it, there’s 57 channels and nothin’ on. As I sit here typing up this article on hot early summer day with my AC blasting, I’m realizing it’s getting cold enough in here that I might need to add a layer. Woe is me! Just a few weeks ago, I bought a new iPhone and quickly found that Apple Music hadn’t automatically moved over all of my locally downloaded tunes during the initial data transfer. I was pretty disappointed when I realized only the second half of Turn on the Bright Lights was available to me on a late night drive home over the weekend. I just want to hear “Obstacle 1”! These are all annoyances, for sure. But none of them truly compare to the King of First World Problems, which is very obviously not being able to keep your perpetual calendar sufficiently wound. I mean, have you tried to reset one of these things recently? It can be really frustrating. Plenty of brands, like IWC earlier this year, have made moves to make their perpetual calendar movements more forgiving when resetting. Gone are the days, hopefully, when jumping past the current year means an expensive trip back to the manufacture in Switzerland.  Vacheron Constantin has a slightly different solution, which is to enable your perpetual calendar to remain wound for weeks at a time by allowing the wearer...

Vacheron Constantin Updates the Twin Beat Perpetual Calendar with a 70-Day Power Reserve

Introducing: The Vacheron Constantin Traditionelle Twin Beat Perpetual Calendar Is Back

What We Know Vacheron just brought back its incredibly unique Traditionelle Twin Beat Perpetual Calendar, and it's a welcome sight for dedicated collectors of the brand, along with general enthusiasts of unexpected yet innovative takes on complicated watchmaking. If you're not familiar with the original Traditionelle Twin Beat Perpetual Calendar, launched back in 2019, the watch offered an incredibly novel solution to a problem often found within perpetual calendar watches. Let's be honest, though the entire appeal and genius of the perpetual calendar is for someone wearing one watch all day, every day, for the whole year, watches like these are most often owned by those with a large collection to begin with. A weekend for a perpetual calendar in a watch box or drawer would mean that the complication would need to be set again after winding, and so Vacheron introduced this perpetual calendar with a whopping 65-day power reserve. To achieve this, rather than putting in an unfeasibly large mainspring in the barrel, the Traditionelle Twin Beat Perpetual Calendar lives up to its name by offering a new system that allows for switching between two beat rates for the watch—a contemporary high-beat 5Hz frequency with a 4-day power reserve for normal timekeeping during wear, but a much slower 1.2Hz mode with that prolonged power reserve for the "Standby" phase. The Caliber 3610QP comprises two separate gear trains for the two regulating systems, with a series of differentials tha...

Vacheron Constantin’s Twin Beat Returns with 70-Day Power Reserve

First launched in 2019, the Vacheron Constantin Traditionelle Twin Beat Perpetual Calendar remains one of the most fascinating watches in its category. Thanks to a movement with a secondary, low-power mode, the Twin Beat has an extended power reserve measured in months – all contained in a reasonably sized, 41 mm case. The original version of the Twin Beat was complex and finicky. Now Vacheron Constantin (VC) has refined and upgraded the movement, resulting in a second generation model with an extra five days of power reserve in Standby mode – which means the watch will run for 70 days. Initial thoughts I described the original Twin Beat as a “genuinely interesting, albeit pricey, watch”. Even though several years have passed, the Twin Beat remains genuinely interesting. It is a novel concept executed in a sophisticated manner. In contrast to majority of ultra-long power reserve watches, the Twin Beat is ordinarily sized. I am certainly glad VC has revived the concept and made it better. The original probably had a few kinks in the movement that made production difficult so the first generation never really made it to market in significant numbers. The kinks have been resolved with the new version, which is probably also more robust from a usability point of view. The same holds true today of the price, though given the overall price index of the market, the new Twin Beat is arguably less expensive in relative terms. The first generation model Two running modes On ...

First Look - Vacheron Constantin Injects Even More Power into its Traditionnelle Twin Beat Perpetual Calendar

First released in 2019, Vacheron Constantin’s Traditionnelle Twin Beat Perpetual Calendar marked a before and after in the sophisticated realm of QPs. While not the first watchmaker to feature dual frequencies, Vacheron’s Twin Beat broke new ground as the first movement allowing you to switch between the two regulating mechanisms, converting a gas guzzling complication […]