The Rolex Submariner Date Ref. 126613LB, famously known as the “Bluesy,” is a modern icon that masterfully blends the robust, professional heritage of the Submariner with the undeniable luxury of precious metal . Celebrated for its distinctive and vibrant aesthetic, this 41mm timepiece features the signature “Rolesor” construction, a harmonious fusion of durable Oystersteel and warm 18k yellow gold . The case is crowned by a unidirectional rotatable bezel set with a scratch-resistant blue Cerachrom ceramic insert, which frames a captivating sunburst royal blue dial . The dial’s rich hue is further accentuated by yellow gold-framed luminous hour markers and the iconic Mercedes hands, all filled with Chromalight for exceptional legibility in any light condition . At its heart lies the advanced in-house automatic Caliber 3235, a Superlative Chronometer certified movement that delivers an impressive 70-hour power reserve and features Rolex’s patented Chronergy escapement and blue Parachrom hairspring for unparalleled precision and shock resistance . Secured by the iconic Oyster bracelet, which combines brushed steel outer links with high-polished yellow gold center links, and an Oysterlock safety clasp with the Glidelock extension system, the watch ensures a perfect and comfortable fit . With a water resistance of 300 meters, the “Bluesy” 126613LB is as ready for the depths of the ocean as it is for the most sophisticated of occasions, making it a highly sought-after centerpiece for any collection . Key specifications: 41mm Rolesor case; sunburst blue dial with yellow gold accents; blue Cerachrom bezel; Caliber 3235 automatic movement; 70-hour power reserve; Oyster bracelet with Glidelock; 300m water resistance; sapphire crystal .