The primary Royal Oak designs were fitted Together with the calibre 2121 movement, which was dependant on the calibre 2120 developed by Audemars Piguet in 1967, the world’s thinnest self-winding movement in the era with date indication, and an Total peak of three.05mm. The calibre 2121 was also equipped by https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/