Ebel Waterproof Watch Crowns to Fit Wave Models: Available sizes: See Drop-Down Selection: CRN - 11 Diameter 3.50mm Tube 1.60mm Tap 10 - Gold Plated (Fits Older Model Wave - Ladies)CRN - 12 Diameter 4.00mm Tube 1.80mm Tap 10 - Gold Plated (Fits Older Model Wave - Mens)CRN - 13 Diameter 3.50mm Tube 2.75mm Tap 10 - Gasket fits on Tube - 18K Gold (Fits Newer Model Wave - Ladies or Mens) Watchpartusa is independent of and not affiliated with or sponsored by Ebel