The primary Royal Oak models ended up equipped With all the calibre 2121 motion, which was based on the calibre 2120 created by Audemars Piguet in 1967, the earth’s thinnest self-winding movement in the era with day indication, and an Over-all top of 3.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/