Complication
Annual Calendar
Knows every month length except February.
What it does
Tracks day, date and month, and automatically skips the 31st in 30-day months — so it stays correct all year without intervention. It has no leap-year mechanism, so it needs one manual correction at the end of February.
How to read it
Read day, date and month from their windows or sub-dials. Advance the date once at the start of March each year. Avoid setting it during the hours around midnight, while the calendar mechanism is engaged.
Impact on value
Positive — a real complication at a fraction of a perpetual calendar's cost, which is exactly why Patek Philippe patented it in 1996.
Keep reading
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A seconds hand on its own sub-dial.
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Built to be legible and watertight deep underwater.