The 1st Royal Oak designs were equipped With all the calibre 2121 motion, which was according to the calibre 2120 made by Audemars Piguet in 1967, the entire world’s thinnest self-winding movement from the era with date indicator, and an overall height of 3.05mm. The calibre 2121 was also equipped https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/