The 1st Royal Oak designs ended up equipped While using the calibre 2121 motion, which was depending on the calibre 2120 created by Audemars Piguet in 1967, the world’s thinnest self-winding motion from the era with date indicator, and an Over-all top of three.05mm. The calibre 2121 was also Outfitted https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/