The Ref. 5512 from 1959 has just about anything we would try to look for on The present Submariner. Its circumstance had grown to 40mm, up with the 37mm to 38mm of earlier parts. Crown-guards were being extra, and the bezel now a little overhung the side of the situation https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/