To many collectors, Rolex sports models with the so-called “three-six-nine-dials” are considered amongst the best looking tool watches of all times. These dials are also called “Explorer dials” since the Explorer I original design featured these numerals too. Other than the Explorer I family, only the large crown Submariners reference 6200, 6538 and 5510 are known with these dials and their successors with crown guards, reference 5512 and 5513. Interestingly, the Explorer I is the only model which has kept this wonderful 1950’s design until today – all other sports watches feature now the baton and round markers.Reference 5513 was the last Submariner to feature the “Explorer-dial”-design and examples of this series are amongst the rarest sports-watches by Rolex. In production only during the first half of the 1960’s, these are today uncommon sightings at international auctions. The present watch from 1964, still signed SWISS at 6 o’clock but already with the additional “underline”, is a wonderful testimony to the transitional period when Rolex stopped using radium for their dials. Not only a rare collector’s watch with great charisma, this “Explorer dial Submariner” is equally rewarding on one’s wrist.