The 1st Royal Oak types have been equipped with the calibre 2121 movement, which was dependant on the calibre 2120 designed by Audemars Piguet in 1967, the world’s thinnest self-winding movement of the era with date sign, and an All round height of 3.05mm. The calibre 2121 was also Outfitted https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/