Patek Philippe Perpetual Calendar compactwidth Twin subsidiary registers

Twin subsidiary registers

So in the early 19th century

and corrector pushers located along the case flanks

several different manufacturers supplied these watches according to MOD standards

the inspiration for the model’s nomenclature)

Patek Philippe Perpetual Calendar compactwidth Twin subsidiary registersA perpetual calendar is like a small computer on your wrist. Think of it this way: Imagine a watch that keeps track of not only the time, but also the date, the day of the week, and the month, and also tells you whether its a leap year or not, and what the current phase of the moon is. Oh, and one more thing imagine it does all of this mechanically, using springs and gears, and that you only have to adjust it once every century or so. Crazy, right?