320W10GN00 Type III
Brand new reproduction mineral glass replacement. Made out of Hardlex, the original material Seiko used. This lower version was created by Seiko to replace the much-higher Type I as well as the Type II to alleviate chipping. The Type III was made from approximately 1976 to the mid 1980s.
1.5mm Thick at center
This crystal is made to fit Seiko watches
Will also it the 6309 and 7548 Divers
This listing is for the crystal only, not the display watch