The main Royal Oak versions were being equipped with the calibre 2121 motion, which was according to the calibre 2120 developed by Audemars Piguet in 1967, the globe’s thinnest self-winding movement on the era with date indicator, and an All round height of 3.05mm. The calibre 2121 was also Outfitted https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/