The very first Royal Oak versions have been equipped With all the calibre 2121 motion, which was based on the calibre 2120 formulated by Audemars Piguet in 1967, the entire world’s thinnest self-winding movement of the period with date sign, and an Over-all peak of 3.05mm. The calibre 2121 was https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/