It was also the first to possess a sapphire crystal, the 1st for being waterproof to 300m, and the final to have a matte dial. The truth is, some quite late operate ref. Beginning output simultaneously given that the ref. 6200, the Submariner ref. 6536 returned to a thinner case https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/