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This reference is for the Blancpain Fifty Fathoms Automatique in Grade 23 titanium on a NATO strap. It shares the same significant history as other 5015 models, tracing its lineage to the original 1953 dive watch. Its modern significance comes from combining the iconic 45mm design and black dial with a lightweight titanium case for enhanced comfort. It’s powered by the robust Caliber 1315 with a 120-hour power reserve. The “-NABA” suffix specifically denotes that it is supplied on a black NATO strap, which emphasizes its military heritage and provides a secure, casual wearing option, distinguishing it from versions on sail-canvas or a full titanium bracelet.
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