I’m servicing my first SEIKO watch housing a calibre 7S36B. Got it on eBay for about £70 and it seems to be in reasonably good condition. The crystal is somewhat scratched. I don’t know if it is mineral or sapphire glass. If mineral (which I assume) I suppose I could diamond paste the scratches, but for several reasons I would like to replace the crystal, the most important reason being I’d like to learn how to. I’ve already removed the old crystal and it’s intact so I could measure it.
However, CousinsUK.com has a ”Seiko Glasses List (Under Construction)” with hundreds and hundreds of mostly original SEIKO crystals. Each crystal is listed with SEIKO’s part number, for example “Glass, Seiko 095N02GN00”. The question is, how do I obtain the part number of my SEIKO crystal?
The numbers I’ve found on my SEIKO are: 7S36-05C0 – printed on the see-through case back,
0D0349 – engraved on the rim of the case back, and
7S36B – engraved on the oscillating weight.