The Tudor Oyster-Prince "Submariner" circa 1959 is the rarest version of the Tudor Submariner. This particular example features square crown guards that were leftover from the Rolex Submariner 5512 but then subsequently replaced by pointed crown guards because they made it too hard to unscrew the crown. The leftover Rolex cases were passed on to Tudor and used in the model (shown). The case measures 39.5 mm in diameter by 14 mm in height. The lugs accept a 20 mm strap and this version is fitted with a brown goatskin leather Nato strap.