The Rolex Submariner Date Ref. 116613LB, affectionately known to collectors as the “Bluesy,” is a true icon of the luxury sports watch world, masterfully combining the robust functionality of a professional diver’s instrument with the unmistakable prestige of precious metal . This celebrated reference features a 40mm Oyster case masterfully crafted from Rolex’s proprietary Oystersteel and 18k yellow gold, a two-tone “Rolesor” construction that creates a striking and elegant contrast . Its captivating vibrant blue sunburst dial and matching blue Cerachrom ceramic bezel are the heart of its identity, with the dial’s color shifting from a deep navy to a bright, sun-kissed azure, providing a stunning backdrop for the luminous gold-framed hour markers and Mercedes hands . The unidirectional bezel, now with a scratch-resistant and fade-proof ceramic inlay, encircles the dial, ensuring the watch remains as resilient as it is beautiful . At its heart lies the legendary in-house automatic Caliber 3135, a COSC-certified Superlative Chronometer, renowned for its precision and reliability, delivering a 48-hour power reserve and featuring Rolex’s signature blue Parachrom hairspring for superior resistance to shocks and magnetic fields . This movement is protected by a 300-meter water resistance, making it a true professional-grade dive watch . The iconic Oyster bracelet, with its combination of polished gold center links and brushed steel outer links, is secured by an Oysterlock safety clasp with the Glidelock extension system, ensuring a perfect and comfortable fit over a wetsuit or on the wrist . A true modern classic and an increasingly collectible piece since its discontinuation in 2020, the “Bluesy” 116613LB is the ultimate statement for those who seek a timepiece that effortlessly transitions from the depths of the ocean to the most sophisticated of occasions . Key specifications: 40mm Rolesor case; sunburst blue dial; blue Cerachrom bezel; Caliber 3135 automatic movement; 48-hour power reserve; Oyster bracelet with Glidelock; 300m water resistance; sapphire crystal.