The 1st Royal Oak models had been equipped Using the calibre 2121 movement, which was based on the calibre 2120 made by Audemars Piguet in 1967, the earth’s thinnest self-winding motion of your era with day indicator, and an All round peak of 3.05mm. The calibre 2121 was also Outfitted https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/