Reference-level buying framework
Compare Patek Philippe Annual Calendar references
Patek Philippe introduced and patented its Annual Calendar mechanism in 1996. The family now spans very different displays, cases and added functions.
Understand the annual calendar
The mechanism automatically accounts for months with 30 and 31 days. February remains the exception, so a watch kept running and correctly set ordinarily needs one manual calendar correction each year after February ends.
Compare displays and added functions
Annual Calendar references range from traditional moon-phase watches to Nautilus and Aquanaut sport-family models. Other executions add a flyback chronograph, Travel Time or regulator-style display.
Verify the exact reference
Reference suffix, dial, metal, dimensions, movement, bracelet or strap, condition, documentation and delivery terms can all change the buying decision.
Setting and service are ownership facts
Confirm correct setting instructions for the exact calibre, functional operation, service disclosure and whether the watch has stopped before adjusting any calendar indication.