Seiko Modding Class 101: Replacing The Crystal and Its Gasket - Crystaltimes USA
WTB: Seiko 6309/6105 Diver Crystal Gasket (Found) | The Watch Site
How to fit a domed sapphire crystal (Seiko 6309-7040) | WatchUSeek Watch Forums
Gasket for skx007 skx011 front crystal gasket and case back Watch accessories Parts For Seiko , Free shipping , 10pcs|Repair Tools & Kits| - AliExpress