Audemars Piguet Royal Oak RD#2 Perpetual Calendar
The Royal Oak RD#2 Perpetual Calendar Ultra Thin by Audemars Piguet is the thinnest self-winding perpetual calendar in the world at just 6.3 mm thickness. It is 41 mm in diameter, with case and bracelet in platinum. The surprising thing about the RD#2 is that, like the Royal Oak Concept RD#1, it is not yet…