The 1st Royal Oak styles ended up equipped While using the calibre 2121 movement, which was based upon the calibre 2120 formulated by Audemars Piguet in 1967, the earth’s thinnest self-winding movement of your period with day indication, and an All round peak of 3.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/