Special Domed 37.50 mm diameter, 1.30 mm Thick Sapphire Glass on top with Anti-Reflective Coating and Flat Sapphire glass 36 mm diameter, 1.1 mm thick on the bottom are used on this 41 mm Sapphire Glass see-thru back watch case made to fit ETA 6497-1 & ETA 6498-1. Dial Diameter needed for this case can be 36.5 mm to 37.2 mm in diameter, the visible dial opening diameter is 36 mm. Comes with a large 7 mm diameter tap 6 (1.2 mm) waterproof crown that fits the 2.5 mm crown tube on the case. The case lug size for a watch strap or bracelet is 20 mm. Distance from lug holes on one side of case to the other lug holes is 44 mm (1 3/4") |
Stainless steel case is a screw off back and water-resistant to 3 ATM, replacement case back gaskets 37.50 mm by 0.60 mm are available. The case is custom made to fit the popular ETA 6497-1 & ETA 6498-1 movements that are 16.5 ligne size (36.6 mm) and 4.5 mm thick. Case does not use a movement ring to hold movement size due to the exact fit of the case to the movement. Simply install the case screws supplied with your movement, backing them off until they just touch the case back after a waterproof seal is made when closing the case tight. See the above YouTube Video on casing this movement. This 41 millimeter diameter case body is only 9.5 mm thick, total height from center of domed crystal to back glass is 11.75 mm.
Case 11 with sapphire glass has printed on the back of the case WATER RESISTANT ALL STAINLESS STEEL SAPPHIRE CRYSTAL The ink printing reportedly is hard to remove requiring a very strong paint/ink remover. In our opinion it is not worth the trouble, since no one but the owner will be seeing the back of the case.