The 1st Royal Oak types had been equipped with the calibre 2121 movement, which was depending on the calibre 2120 designed by Audemars Piguet in 1967, the earth’s thinnest self-winding movement from the era with date indication, and an All round peak of 3.05mm. The calibre 2121 was also Geared https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/