The Ref. 5512 from 1959 has just about almost everything we might seek out on the current Submariner. Its circumstance had developed to 40mm, up within the 37mm to 38mm of earlier pieces. Crown-guards ended up included, plus the bezel now a little bit overhung the side of the case https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/