The 1st Royal Oak styles had been fitted With all the calibre 2121 motion, which was based upon the calibre 2120 designed by Audemars Piguet in 1967, the whole world’s thinnest self-winding movement of the period with date sign, and an Total top of three.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/