At first glance this exceptionally rare, highly desirable, and early rendition of the iconic Rolex Explorer model impresses. However, upon further inspection, the engraving, ‘R.P.S. SOVEREIGN, MT. EVEREST’, found on the caseback adds an air of mystery. Research indicates the ‘R.P.S’ initials most likely stands for the ‘Royal Photographic Society’ - one of the oldest photographic societies in the world, with a rich history dating back to 1853. The Royal Photographic Society has strong ties to the climbing expeditions that have taken place on Mount Everest. Rolex launched the now famous Explorer in 1953 to honor those who conquered Mount Everest for the first time that year wearing Rolex watches on their wrists. The model celebrated mankind’s desire to push the boundaries of human limits. This early Explorer reference 6610 dates to 1958, and one can assume it was a most appropriate gift for a professional who performed noteworthy work on Everest. The glossy black dial has aged to a consistent and pleasing shade of mocha over the course of its approximately 60-year life. Its rare and original, elongated gilt hour, minute and seconds hand further add to its beauty. The case is in superb condition - with sharp edges and wonderful proportions. Collectors will certainly appreciate the ‘Stainless Steel’ engraving on the caseback that is still crisp. Such shallow engravings are hard to find on early Rolex sports watches as they are easily worn away from constant contact with a wearer’s wrist. Collectors will also admire the beauty of the caliber 1030 housed within, which has developed a pleasing patina in a magnificent shade of pink. In overall excellent condition, this Explorer is as much a trophy for any vintage Rolex sports watch collector today as it was for the pioneer who first wore it.