The primary Royal Oak products were fitted with the calibre 2121 movement, which was dependant on the calibre 2120 designed by Audemars Piguet in 1967, the world’s thinnest self-winding movement on the period with day sign, and an overall peak of 3.05mm. The calibre 2121 was also Outfitted using a https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/