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Calendar types in watches
Mechanical watches that can show a date correctly are pretty rare, and the ones that do are very expensive (starting at $10k). But why? Let me explain.
It could be a cutoff display, like the date that shows the year in Arabic numbers, or as three characters shortcuts (Jan, Feb, Mar, etc...). A. Lange & Söhne has a short video showing how various levers and hands operate to support Perpetual Calendars in watches. But in daily life, knowing the leap year is not that important; hence, some watchmakers put them on the back of the watch to make room on the dial.
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