The first Royal Oak types have been fitted with the calibre 2121 motion, which was based upon the calibre 2120 developed by Audemars Piguet in 1967, the globe’s thinnest self-winding motion of the period with date sign, and an General top of 3.05mm. The calibre 2121 was also equipped having https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/