The Ref. 5512 from 1959 has pretty much all the things we might hunt for on The existing Submariner. Its situation had developed to 40mm, up through the 37mm to 38mm of previously items. Crown-guards have been included, and the bezel now a bit overhung the side of the case https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/