Also worth noting - calendar watches should have the calendar function set when it is between 3:00 and 9:00, because between 10:00 PM and 2:00 AM the calendar wheels under the dial may be engaged for moving the calendar dials and you can damage them by forcing them to move. I have fixed a few perpetual calendar repeater watches that do not have the leap year (4 year) index, but most do. This is likely an annual calendar watch and the only way to tell is to set it for the last day of an non-30 day month and then set the time forwards until the calendar changes. If it jumps to day 1, it is a perpetual calendar. If it does not, it is an annual calendar.
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