The first Royal Oak types were fitted with the calibre 2121 movement, which was based upon 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 Geared up having https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/