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Perpetual Calendar Watches

With its ingeniously pre-programmed movement, a perpetual calendar takes into account the months that have less than 31 days, as well as leap years, and therefore needs no adjusting until the year 2100. This revered complication is found in the finest watches from the most established brands.

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Perpetual Calendar Watches

Perpetual Calendars History

One of the most complex and revered mechanisms in watchmaking, the perpetual calendar is something only seen in the top-tier watches of the finest brands.

While watches with an annual Gregorian calendar—i.e., one that displays the day, date and month and requires manual adjustment only for the month of February—are complicated enough, the perpetual calendar goes even further.

Assuming it keeps on ticking without interruption, a perpetual calendar requires (almost) no manual adjustment by its wearer as it is designed to account for the four 30-day months and the 28 days of February, as well as leap years.

In fact, the next time a perpetual calendar needs adjustment (which will require the intervention of a skilled watchmaker) won’t be until 2100. This is because a perpetual calendar doesn’t account for the fact that years divisible by 100 are not leap years unless also divisible by 400, which the year 2100 isn’t.

This minor hindrance doesn’t detract from the fact that the perpetual calendar is a truly remarkable feat of horology—one that was first explored in clocks by the 17^th-century English watchmakers Thomas Tompion and George Graham.

However, it wasn’t until the following century that their compatriot Thomas Mudge managed to shrink the mechanism into a pocket watch. By the early 20^th century, pocket watches were beginning to fall out of favour, paving the way for Patek Philippe to create the first perpetual calendar wristwatch in 1925. Today the brand continues to make some of the most sought-after examples of perpetual calendars.

Many other leading brands, including Vacheron Constantin, A.Lange & Söhne and Audemars Piguet, also produce perpetual calendars, and despite its complexity it is also sometimes paired with other functions, such as a flyback chronograph, a moonphase or a minute repeater. Indeed, a watch combining all these complications—and sometimes more—is known as a grande complication.

Due to the skill, craftsmanship and time required to create these mechanisms, perpetual calendars are among the most expensive watches to buy, with rare vintage models—especially those by Patek Philippe—fetching huge sums at auction.

How they work

A perpetual calendar ingeniously accounts not only for the discrepancies in the days of the month—including February with its anomaly of 28 days—but also the leap year that occurs every four years when February has an extra day.

This means that, theoretically, it can keep the correct time and date, with no adjustment required, until 2100.

This is achieved by a series of gears that counts the years and leap years in addition to the days and months. The movement is pre-programmed to memorise the number of days in each month in the teeth of their wheels, with the slowest wheel—for the leap year—turning once every four years.

How a perpetual calendar works depends, of course, on the brand and model, but it typically relies on an intricate system of cams and wheels that exceeds any other type of movement in terms of its complexity and number of individual components.

In terms of the dial displays, a perpetual calendar generally looks like any other watch that features a day, date and month, except that there will usually be a discreet leap-year indicator, too.

This can be in the form of a small aperture or subdial, or even displayed on the reverse of the watch through the caseback.

Notable perpetual calendar models

A.Lange & Söhne Lange 1 Perpetual Calendar, reference 345.056 E

One of A.Lange and Söhne’s most coveted models, the Lange 1 Perpetual Calendar features an asymmetric dial display that’s synonymous with the Glashütte aesthetic. There are three variations in either pink gold or platinum, each with a different coloured dial, but the limited-edition salmon-dial version is the one that will edge it for many collectors.

Patek Philippe Perpetual Calendar reference 5970

Now discontinued, the reference 5970 was produced from 2004 to 2010 and is considered one of the greatest perpetual calendars of the modern era. This classically designed watch, which is also a chronograph and features a moonphase display at 6 o’clock, can trace its roots to the similar-looking 1518 from the 1940s. Only 2,800 examples are thought to have been produced across all four precious metals.

Ochs Und Junior Perpetual Calendar

Ludwig Oechslin, the man behind Ochs Und Junior, has made one of most deceptively simple perpetual calendars around. Its minimalist dial displays the time and calendar via concentric sets of dots, with no numerals in sight, giving it a highly distinctive, contemporary appearance. Even the case is made from unconventional materials, namely titanium or sterling silver.

Vacheron Constantin Overseas Perpetual Calendar Ultra-thin Skeleton 4300V/220R-B642

Since its introduction in the 1990s, Vacheron Constantin’s Overseas collection has grown to include all manner of complications, from dual-time models to chronographs. But this skeleton-dial perpetual calendar in either pink or white gold stands out for its exceptional craftsmanship and beauty.

Patek Philippe Minute Repeater Perpetual Calendar reference 5374/300P-001

This extremely rare Patek Philippe model is an audio and visual masterpiece, featuring two contrasting yet equally revered complications: a minute repeater and a perpetual calendar. Boasting a platinum case embellished with baguette-cut diamonds and sapphires, it’s one of the brand’s finest examples of an Haute Joaillerie timepiece.

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