Perhaps you should send it to someone who can also get the crystal and let them do the entire service. I doubt that someone will simply sell you the crystal unless you can find someone with a stock of them. And I guess you've already looked.
I don't know why your AD can't get the part, but I wouldn't assume that they necessarily can speak for every watchmaker in your country. They might claim that, but you won't know until you ask around.
@Archer already indicated that an actual watchmaker with a parts account can order those crystals, so I think you should contact some other options one by one.
Click to expand...