Rolex Day-Date President 6613

Reference 6613 identifies the factory diamond-bezel model from the second Day-Date series, produced for a brief period from approximately 1957 to 1959. It is powered by the improved Caliber 1055, which is historically significant for its implementation of a free-sprung balance with Micro-Stella regulation. This technical upgrade allowed the movement to achieve ‘Superlative Chronometer’ certification. The 36mm Oyster case, constructed in 18k gold and fitted with an acrylic crystal, is distinguished by its factory-set brilliant-cut diamond bezel. The significance of the 6613 is its position as the first truly high-performance jewelry watch in the Day-Date lineage, combining Rolex’s most advanced movement of the era with its factory gem-setting capabilities. Its extreme rarity makes it a ‘grail’ for collectors.