The very first Royal Oak models have been fitted with the calibre 2121 motion, which was determined by the calibre 2120 developed by Audemars Piguet in 1967, the entire world’s thinnest self-winding movement on the period with date indicator, and an In general top of three.05mm. The calibre 2121 was https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/