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We had it done around 1993. I can't remember the cost, but it was reasonable. I'm not sure of the process, but it would be worth investigating to see it if be done by a DIY'er.
Earl
Thought I wouldn't be getting an answer after all, thanks for the information. Did you think the cost was excessive, or was it reasonable?
We had an old mirror refinished at a glass shop. They used silver nitrate to recoat the mirror. Turned out great.
Earl