The first Royal Oak types were fitted Using the calibre 2121 motion, which was based on the calibre 2120 created by Audemars Piguet in 1967, the planet’s thinnest self-winding movement in the era with date indication, and an overall height of 3.05mm. The calibre 2121 was also equipped with a https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/