The very first Royal Oak models ended up fitted with the calibre 2121 movement, which was determined by the calibre 2120 produced by Audemars Piguet in 1967, the earth’s thinnest self-winding motion on the era with day sign, and an overall top of 3.05mm. The calibre 2121 was also equipped https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/