The first Royal Oak styles were being equipped Using 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 in the period with date indication, and an All round peak of 3.05mm. The calibre 2121 was also https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/