It was also the primary to have a sapphire crystal, the very first to be water-proof to 300m, and the final to have a matte dial. The truth is, some extremely late run ref. Starting manufacturing concurrently since the ref. 6200, the Submariner ref. 6536 returned into a thinner situation https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/