The main Royal Oak types ended up fitted with the calibre 2121 movement, which was depending on the calibre 2120 developed by Audemars Piguet in 1967, the entire world’s thinnest self-winding movement with the period with date indicator, and an All round peak of three.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/