The 1st Royal Oak products had been equipped with the calibre 2121 motion, which was based on the calibre 2120 developed by Audemars Piguet in 1967, the entire world’s thinnest self-winding movement with the period with date indicator, and an Over-all height of three.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/