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Omega® Crown (Waterproof, threaded), titanium, matt finish, case numbers: 178.0504, 378.0885 AS 1788 050 and 451Omega Crown (Waterproof, threaded), titanium, matt finish, case numbers: 178. 0504, 378. 0885 Omega Titanium Matt Finish Threaded Waterproof Crown, diameter 6. 00 mm, fits tube 2. 50 mm, total height 6. 00 mm, long pipe, tap 0. 90 mm, fits tube 090ST4199. Fits Omega case numbers: 1780504, 3780885 *Perrin Supply Ltd is independent of and not affiliated with or sponsored by Omega. Omega warranty does not apply to parts supplied byPerrin Supply Ltd.