It had been also the initial to possess a sapphire crystal, the main to generally be waterproof to 300m, and the last to have a matte dial. In truth, some pretty late operate ref. Starting generation concurrently because the ref. 6200, the Submariner ref. 6536 returned to a thinner case https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/