Ah yes, the Hebrew calendar on the 57260 is sorta mind-bending to figure out. It's hard to imagine figuring that out by mere observation and tabulating records.

Ah yes, the Hebrew calendar on the 57260 is sorta mind-bending to figure out. It's hard to imagine figuring that out by mere observation and tabulating records. Their more recent Berkley Grand Complication [1] took things a step further with a Chinese Perpetual Calendar, which is kinda hard to explain. The article linked does a better job than I would at walking through the system. 1: https://www.hodinkee.com/articles/introducing-vacheron-constantin-berkley-grand-complication https://www.hodinkee.com/articles/introducing-vacheron-const...