IWC Ocean 2000 reference 3509 German military combat swimmers wristwatch in titanium, Switzerland around 1985, self winding, frosted case, screwed-down case back & winding crown, blackened unidirectional revolving bezel, case back marked 'BUND' without supply-number, probably changed by revision 1997, original titanium bracelet supply-number 6645-12-197- 8449 with deployant clasp, additional grosgrain ribbon, black dial with luminous- indices, original luminous hands, rhodium plated movement calibre 3752 with gilded rotor, 22 jewels, precision adjustment, thereunto service-box of IWC, service-warrantyof 1997, original screwdriver supply-number 5120-12-198-3797, diameter approx. 43 mm, length approx. 19 cm, condition 2-3, property of a collector