The Ref. 5512 from 1959 has pretty much anything we would try to find on the current Submariner. Its case had developed to 40mm, up from the 37mm to 38mm of earlier items. Crown-guards ended up included, and the bezel now a little bit overhung the aspect of the case https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/