The Ref. 5512 from 1959 has pretty much every little thing we might try to look for on The existing Submariner. Its scenario had grown to 40mm, up from your 37mm to 38mm of earlier pieces. Crown-guards were being included, and also the bezel now a little overhung the facet https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/