IWC 3509 Ocean Bund Titanium Black Dial

The IWC 3509 Ocean Bund is a rare and historically significant military diver’s watch, produced in the early 1980s for German Bundeswehr combat divers. Crafted in lightweight titanium and measuring approximately 42 mm in diameter, this model features a flat sapphire crystal and a matte black dial designed for maximum legibility. Powered by IWC’s automatic calibre 375 (and later 3752 or 37521), the movement operates at 28,800 vph with a 42‑hour power reserve and enhanced rotor bearing jewels, reflecting IWC’s commitment to precision and reliability. Unlike the civilian Ocean 2000 rated to 2000 m, the Bund version was tested to 300 m to meet military specifications, underscoring its tool‑watch pedigree. The integrated titanium bracelet or NATO‑style strap, along with the military stock markings on the case back, further reinforce its utilitarian origins. Released circa 1983, this watch encapsulates the collaboration between IWC and Porsche Design and represents one of the last purpose‑built military models from IWC, making it a compelling piece for serious collectors. Like New with IWC travel pouch, two additional NATO straps, case back opener and Extract from the Archives dated 2011.