These flat black rubber gaskets generally fit into a groove or recess in the back of the case and are most commonly used with a threaded case back. Simply measure the inside diameter and outside diameter of the groove the gasket will fit into on the case. Subtract the inside diameter from the outside diameter then divide in half to find the thickness of the gasket you need to fit your watch case. With 100 different diameters and multiple thicknesses you should be able to find a gasket to fit your watch. These flat gaskets are sold in sets of three to allow watchmakers and others who work on watch case backs to order exactly the flat gasket they need.
- Sold in packages of 3 pieces
- Use the chart below to determine which gasket you need to order
- Maintain airtight seal
- Made of Rubber
- **Note** Diameter measured is the interior diameter of the gasket