The primary Royal Oak versions had been fitted Using the calibre 2121 movement, which was according to the calibre 2120 produced by Audemars Piguet in 1967, the world’s thinnest self-winding movement from the era with day indication, and an overall peak of 3.05mm. The calibre 2121 was also equipped with https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/