The 1st Royal Oak types were fitted With all the calibre 2121 movement, which was determined by the calibre 2120 made by Audemars Piguet in 1967, the whole world’s thinnest self-winding motion in the era with date indicator, and an Over-all peak of 3.05mm. The calibre 2121 was also Outfitted https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/