The challenge of leap year has led to the development of the perpetual calendar - a complication that has been part of the A. Lange & Söhne repertoire since the late 19th century.

If a perpetual calendar were kept continually operating, it would correctly adjust until the year 2100, when our Gregorian calendar skips the normal leap year. At that point, the mechanism ...

James Ward Packard took delivery of a Patek Philippe perpetual calendar desk clock with eight days of power reserve, in a ...

5 most impressive perpetual calendar watches for a leap year: haute horology from Bulgari, A. Lange & Söhne, IWC, Glashütte Original and H. Moser & Cie on February 29, 2024 ...

Measuring just 4.5 mm tall, the openworked perpetual calendar Calibre 5135 features 374 components to power day, date, month, leap year, week number, and time-telling indications.

In the watchmaking pantheon, the perpetual calendar is one of the most prized feats of horology, revered by collectors and coveted by enthusiasts. The perpetual calendar is, as its name suggests, self ...

Measuring just 4.5 mm tall, the openworked perpetual calendar Calibre 5135 features 374 components to power day, date, month, leap year, week number, and time-telling indications.

The eternal calendar, which is built on IWC’s almost four decades of expertise with the perpetual calendar, is not only programmed for the four-year cycle, including the leap day in February, but is ...