The Ref. 5512 from 1959 has pretty much anything we would hunt for on the current Submariner. Its circumstance experienced developed to 40mm, up with the 37mm to 38mm of earlier items. Crown-guards were being added, as well as the bezel now a little overhung the aspect of the situation https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/