Repairs to a Seiko Lassale - Any ideas

[omniflow]

Probably a long shot but worth a go.

I have a Seiko Lassale watch that was brought in 1985. Super thin, very subtle, kept perfect time. I wore it every day for about 20 years. It stopped working. New battery did nothing. I sent it off to Seiko for repair, and they told me one of the cogs was corroded and they didn't have the parts - this was probably about 7 years ago.

I've been looking for a replacement ever since, and really not found anything I like as much. Any recommendations for anyone who could repair it?

Thanks in advance.