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Patek Philippe

I will say, Patek Philippe Annual Calendars are very unreliable.

 

I'd say I've seen several annual calendars suffer problems in the first year of ownership. Date change doesn't work properly. Funny thing, the date change will work correctly if you advance the time by the crown, but it won't work if the watch is on a winder! Something about the crown movement is different than the natural winder movement. I've seen this several times and I would guess a significant percentage, possibly as high as 1/6 or 1/7 (around 15%) of all annual calendars with the 324 base movement (5146, 5396, and similar movement models) probably have this problem for a year or two years. I've also seen two or three 5960s with this problem, although they were earlier 5960s.

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