I have collected Seiko watches for 50 years

If you need advice on which gasket, tell me the 8 digit case back number

I can check you have the correct part, or give you the correct part number 

Seiko Generic Case Back Gasket Seal

FH3181B01

 Gasket Seal "O"Ring 

Post Free

                                                         I can pre-grease you gasket/seal, silicon grease, just ask