The Ref. 5512 from 1959 has pretty much every thing we'd look for on the current Submariner. Its circumstance experienced grown to 40mm, up with the 37mm to 38mm of previously pieces. Crown-guards were additional, and the bezel now slightly overhung the side of the case to make it easier https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/