Watch Anatomy Vol. 40: Special Feature on Perpetual Calendar Models from Commit

A perpetual calendar is one of the world's three most complicated mechanical mechanisms. It is a mechanism that automatically adjusts the calendar to account for not only the difference in the number of days in a month (30 or 31 days) but also the leap year (February 29th) that occurs once every four years.
This mechanism, which can be said to be the pinnacle of micromechanism, as in theory the date will not need to be adjusted until 2100, combines particularly high practicality and status among the many complication watches.

This time, we will introduce five exquisite perpetual calendar models that embody the philosophy of each brand. Please enjoy until the end.

If you are interested in any of the watches, please take this opportunity to register your interest (request for restock).

① [Patek Philippe] "Perpetual Calendar Retrograde" "Ref. 5160/500G-001"

Basic specifications : Year of manufacture: circa 2016 Case: 38.0mm
Material: 18KWG
Water resistance: 30m Movement: Automatic Cal.324 S QR

Among Patek Philippe's Grand Complications, this is one that stands out for its artistic merit. Its greatest feature is the hand-engraving that covers the entire surface of the "Officer's Case," modeled after an officer's watch. The center of the dial, bezel, case sides, lugs, and even the hunter case back are all meticulously engraved by skilled artisans, making this a model of exceptional value as a work of art.
In terms of functionality, the retrograde date display moves in a fan pattern and instantly returns to the 1st at the end of the month, allowing you to enjoy the movement of the hands themselves. This is a rare model with very little circulation on the market, making it the ultimate collector's watch.

■Product page here👉 https://commit-watch.co.jp/products/trvd2sti

② [A. Lange & Söhne] Datograph Perpetual Tourbillon "Ref. 740.056FE"

Basic specifications : Year of manufacture: circa 2016 Case: 41.5mm
Material: 18KWG
Water resistance: 30m Movement: Manual winding Cal.L952.2

This is an all-inclusive, extraordinary model that combines the Datograph, the pride of A. Lange & Söhne, the pinnacle of German watchmaking, with a perpetual calendar and tourbillon.
Of particular note is the solid pink gold salmon dial paired with a white gold case. While salmon has become extremely popular in the luxury watch market in recent years, A. Lange & Söhne's version, crafted from solid PG, offers a truly exceptional texture. While the watch embodies the romance of mechanical watches with a flyback chronograph, a precision jumping minute counter, and a tourbillon with hacking function, the dial layout remains neat and tidy without compromising legibility. Limited to a worldwide run of just 100 pieces, this is a watch of the highest quality, both in terms of investment value and satisfaction.

■Product page here👉 https://commit-watch.co.jp/products/ixmh62sg

3. Vacheron Constantin Patrimony Perpetual Calendar Chronograph, Reference 49005/000P-7622

Basic specifications : Year of manufacture: -- Case: 38.0mm
Material: PT
Water resistance: Water resistant for everyday use Movement: Automatic Cal.1136QP

A perpetual calendar model from the Patrimony series, which represents Vacheron Constantin in the 1990s.
The 38mm platinum case is the perfect size for a Japanese wrist, and features a perpetual calendar and chronograph. Its classic, concentrated beauty sets it apart from the increasingly large complications of recent years. The Cal. 1136 QP movement is a thin movement based on Frederic Piguet, boasting a proven track record of reliability. The solid weight and overall simple design, characteristic of platinum, exude a sensuality unique to neo-vintage watches. While current models continue to rise in price, this is a highly recommended choice for connoisseurs.

■Product page here👉 https://commit-watch.co.jp/products/d8rm7mhh

④ [IWC] "Portugieser Perpetual Calendar 44" "Ref. IW503701"

Basic specifications : Year of manufacture: circa 2024 Case: 44.4mm
Material: Armor Gold
Water resistance: 50m Movement: Automatic Cal.52616

This is a perpetual calendar model of the Portugieser, equipped with the legendary module designed by Kurt Klaus, the father of IWC's perpetual calendar mechanism.
The biggest feature of this watch is that it uses a new material developed exclusively by IWC called "Armor Gold." It is more resistant to wear and tear than conventional red gold, and because it is harder, it will maintain its beautiful shine for a long time.
In terms of functionality, IWC's unique Pellaton automatic winding mechanism provides an astonishingly long power reserve of 7 days. The high practicality of being able to operate all calendar functions with a single crown makes this a highly acclaimed complication suitable for everyday use. The large 44mm case also creates an impressive presence.

■Product page here👉 https://commit-watch.co.jp/products/muyxsa8v

⑤ Breitling Navitimer B19 Chronograph 43 Perpetual Calendar (Ref. PB1920251C1P1)

Basic specifications : Year of manufacture: circa 2025 Case: 43.0mm
Material: SS
Water resistance: 30m Movement: Automatic Cal. Breitling B19

[Breitling] A noteworthy new release to commemorate the 140th anniversary of the company's founding.
It is equipped with the brand's first in-house developed and manufactured perpetual calendar chronograph movement, the "Caliber B19." Of particular note is the luxurious exterior that combines a stainless steel case with a platinum bezel and the trendy "ice blue" dial.
While traditional perpetual calendar models tend to be quite expensive, the under-5 million yen price tag for this model, with its fully in-house movement and these specifications, is a very strategic move, and one that offers excellent value for money. While retaining the sporty look of the Navitimer, this watch also boasts a top-tier complicated mechanism, making it a masterpiece of a new generation that combines practicality with a sense of style.

■Product page here👉 https://commit-watch.co.jp/products/p3dx48hb

summary

What did you think?
The perpetual calendar is an extremely delicate mechanism, but each brand has a completely different approach: Patek Philippe's artistic engraving, A. Lange & Söhne's extreme complexity, Vacheron Constantin's classic aesthetics, IWC's practical new materials, and Breitling's cutting-edge technology.
Both of these are special timepieces that go beyond the original purpose of a watch, which is to tell the time, and owning one is a status symbol. We encourage you to pick up an actual watch and experience its profound appeal for yourself.

See you later!