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An excellent example of the Second-Series ref. 5516 with the leap-year indicator at 12 o'clock, sans the 48-month scale; the watch seen here is presently part of the Pygmalion Gallery's private collection (Image: Photo and watch, property of Pygmalion Gallery)

The Complete History of the Audemars Piguet Perpetual Calendar

The following article is written by Wei ‘Le Wei’ Koh, in collaboration with Michael...
2020 41.5mm Overseas Perpetual Calendar Ultra-Thin Skeleton ref. 4300V/120R-B547 on a 18K 5N pink gold bracelet

Why the Overseas Perpetual Calendar Ultra-Thin Skeleton is the Coolest Debut of 2020

Wei Koh makes his case for why the Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin Skeleton is the coolest debut of 2020 (thus far).
Sun Dial

What is Equation of Time

As as watch complications go, equation of time is as exotic as it gets; but it’s about the very sun on which all life relies, no reason for estrangement.
Close up of IWC Da Vinci Perpetual Calendar

Character is Forever: The Perpetual Calendar

A simple date display is a pretty handy thing. This Rolex innovation that has...

The Audiophile’s Minute Repeater

Minute repeaters have always commanded skills of watchmakers more akin to those who produce...

Technical