The 1st Royal Oak products were equipped While using the calibre 2121 movement, which was depending on the calibre 2120 developed by Audemars Piguet in 1967, the earth’s thinnest self-winding motion of the period with date indicator, and an Over-all top of 3.05mm. The calibre 2121 was also Outfitted by https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/