The 1st Royal Oak models had been fitted While using the calibre 2121 movement, which was based upon the calibre 2120 developed by Audemars Piguet in 1967, the earth’s thinnest self-winding movement from the period with date indication, and an Over-all height of 3.05mm. The calibre 2121 was also Outfitted https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/