The 1st Royal Oak styles were equipped with the calibre 2121 movement, which was based on the calibre 2120 made by Audemars Piguet in 1967, the globe’s thinnest self-winding movement of your era with day indicator, and an General top of three.05mm. The calibre 2121 was also Geared up with https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/