The main Royal Oak models were being equipped with the calibre 2121 motion, which was based upon the calibre 2120 formulated by Audemars Piguet in 1967, the whole world’s thinnest self-winding movement on the period with day sign, and an General top of three.05mm. The calibre 2121 was also equipped https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/