The 1st Royal Oak models were being fitted with the calibre 2121 movement, which was based upon the calibre 2120 made by Audemars Piguet in 1967, the globe’s thinnest self-winding movement from the era with date indicator, and an In general height of three.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/