Omega® Crown (Waterproof, Tap 0.90 mm), steel, square, see all case numbers in description Omega® 500 These round plastic crystals are

These round plastic crystals are very thin and used for Hunting Case type pocket watches

Genuine Omega® hour wheel for flat dial

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Zenith 1510

second hand moves in exact one second steps

Omega® Crown (Waterproof, Tap 0.90 mm), steel, square, see all case numbers in description Omega® 500 These round plastic crystals areOmega Crown (Waterproof, Tap 0. 90 mm), steel, square, see all case numbers in description Omega Steel Waterproof Crown, square, diameter 4. 50 mm, fits tube 2. 00 mm, total height 2. 40 mm, flush pipe, tap 0. 90 mm. Fits Omega case numbers: 11000, 11074, 135017, 135017SP, 135018, 135018SP, 135019, 135019SP, 135030, 1350016, 1350017, 1350019, 136017, 136017SP, 136018, 136018SP, 136019, 136019SP, 136022, 136028, 136030, 1360017, 1360019, 1360099,