The Ref. 5512 from 1959 has pretty much almost everything we would try to look for on The present Submariner. Its situation experienced developed to 40mm, up in the 37mm to 38mm of earlier pieces. Crown-guards were extra, as well as the bezel now a little bit overhung the side https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/