The Ref. 5512 from 1959 has pretty much everything we would try to look for on the current Submariner. Its case experienced developed to 40mm, up from the 37mm to 38mm of earlier parts. Crown-guards had been additional, along with the bezel now marginally overhung the aspect of the situation https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/