The main Royal Oak models were being equipped With all the calibre 2121 movement, which was dependant on the calibre 2120 developed by Audemars Piguet in 1967, the whole world’s thinnest self-winding motion from the period with day indication, and an Over-all height of three.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/