The initial Royal Oak models had been equipped With all the calibre 2121 motion, which was dependant on the calibre 2120 created by Audemars Piguet in 1967, the earth’s thinnest self-winding movement with the era with day indication, and an Total top of 3.05mm. The calibre 2121 was also Outfitted https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/