Only deal with Seiko, they did a superb job on my grandfather's 17 jewel auto circa '71. The crystal on that was scratched to buggery (he was a gardener all his working life) and they asked me if I wanted it replaced. However, I just opted to have it polished as keeping the original crystal in place seemed important. I'm sure they'd be able to help you out.
These people:
http://www.vintageseikorepair.co.uk/
Only deal with Seiko, they did a superb job on my grandfather's 17 jewel auto circa '71. The crystal on that was scratched to buggery (he was a gardener all his working life) and they asked me if I wanted it replaced. However, I just opted to have it polished as keeping the original crystal in place seemed important. I'm sure they'd be able to help you out.