Why Audemars Piguet Spent 600 Hours in R&D for the new Case of the Royal Oak Perpetual Calendar Black Ceramic

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The Audemars Piguet Royal Oak Perpetual Calendar Ceramic watch was 600 hours in R&D.

One of the most bed watches of this year may well be the Audemars Piguet Royal Oak Perpetual Calendar Black Ceramic watch. What makes the watch so hot is the fact…

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