The very first Royal Oak types have been equipped with the calibre 2121 motion, which was depending on the calibre 2120 designed by Audemars Piguet in 1967, the world’s thinnest self-winding movement in the era with date indicator, and an Over-all peak of 3.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/