If I were forced to send a vintage watch to any manufacturer, I would clearly state what would not be acceptable (e.g. case polishing, re-lume, etc.), and reinforce it in writing. Were the manufacturer not to agree to my terms, I would find a work-around.
Yes, sometimes a hard-to-find part is required. But I would still refuse to do (service) business with a company that makes outrageous demands.
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