The Tudor Submariner series was in many ways different from the other product lines adopted by Tudor. Unlike almost all Tudor models, the Tudor Submariner uses the same model designation as the Rolex equivilant – i.e. Submariner. In the newest variations introduced after the 1990’s they changed the name to Hydronaut – but from 1956 till the mid 90’s – the Tudor Submariner existed as an almost carbon copy of it’s Rolex sister. The only significant differences were the movements, the use of blue dials and bezels on some models and of course the fact that the later Tudor Submariners were offered in four different sizes!