Seiko Case Seal for Seiko Watches including Seiko 5M42, 5M43, 7546 and 8229.
Genuine Seiko case seal for many Seiko watches. Seiko part number FH2980B01 or FH2980B0A. This is a flat, black gasket with rectangular cross-section.
Will fit Seiko watch cases with the following case codes:
Approximate external diameter: 32 mm.
Approximately internal diameter: 30 mm.