The main Royal Oak styles were fitted With all the calibre 2121 motion, which was based on the calibre 2120 made by Audemars Piguet in 1967, the entire world’s thinnest self-winding motion on the period with date indicator, and an General peak of 3.05mm. The calibre 2121 was also equipped https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/