Richard Mille

How does it work then?...more specifically on the 28th Feb mine went to 29 then 30th then to the 1st march. Seems strange, I mean ok its an annual calendar so I understand it might have to go to 29th every february and need correcting by a day, but to got... 

Feb is the only month that the Annual Calender does not take care off.

It's easier to design the watch with just two options, 30 and 31 days. Most annual calendars are designed that Feb has 30 days so you are off by one day in a leap year and 2 in a non-leap year.

Thanks Allen...perfect explanation, another one of my little mysteries solved cheers

perpetual calendars correct this "nuisance".