The Ref. 5512 from 1959 has just about almost everything we might hunt for on the current Submariner. Its circumstance had grown to 40mm, up from the 37mm to 38mm of earlier parts. Crown-guards were added, and also the bezel now a little bit overhung the facet of the case https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/