The 1st Royal Oak models were being equipped While using the calibre 2121 motion, which was depending on the calibre 2120 designed by Audemars Piguet in 1967, the world’s thinnest self-winding motion in the era with date indication, and an overall peak of three.05mm. The calibre 2121 was also Outfitted https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/