In-Depth – Audemars Piguet Royal Oak Selfwinding Perpetual Calendar Ultra-Thin (World’s Thinnest QP)

The Audemars Piguet Royal Oak SelfWinding Perpetual Calendar Ultra-Thin, which started its life as a prototype watch named RD#2, is one of these watches that look so right. It is at once a superb design object and a highly engineered piece of horological ingenuity. Of course, it is the thinnest perpetual calendar wristwatch. But interestingly, its development was not initiated to break any record. The idea was simply to design a perpetual calendar Royal Oak that could easily slip under any cuff…

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