The first Royal Oak versions were fitted Using the calibre 2121 motion, which was based upon the calibre 2120 created by Audemars Piguet in 1967, the planet’s thinnest self-winding movement on the era with date sign, and an Total peak of 3.05mm. The calibre 2121 was also Geared up with https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/