By varying the size of the subsequent cogs in the gear train ... The British watchmaker Thomas Mudge built the first working perpetual calendar pocket watch in 1762, and then watchmakers ignored (or ...

Although honours for designing the first perpetual calendar pocket watch go to an Englishman ... diminutive case size (approximately 34mm). However, for the erudite, ergonomic and easily legible ...

A Vacheron Constantin pocket watch has 63 complications, including what the brand said is another world first: a Chinese perpetual calendar. By Roberta Naas Beating its own record for the world ...

Audemars Piguet Reference 25729PT pocket watch for the 20th anniversary of the Royal Oak in 1992. Audemars Piguet Measuring just 4.5 mm tall, the openworked perpetual calendar Calibre 5135 ...

as well as a pocket watch presented to Queen Victoria at the 1851 Great Exhibition in London. “We also have the first perpetual calendar movement that was created in the late 1980s. [Patek ...