Just an FYI - seeing that the seller is in Vernon, BC, I suspect the place that did the service is:
http://thegermanwatchmaker.sites.ca/index.php
When you consider that the movement plates and bridges are made of brass, if all plating were removed, it would be yellow, not silver. To me it looks like the chronograph bridge is a slightly different finish, so it might have been stripped and plated to try to match the rest of the movement by someone. Who did this is not certain, and I would not accuse the watchmaker until we know the details. For all we know he was brought the watch this way and just serviced it. I can assure you that to most watchmakers, a vintage Speedmaster is just another watch to service, and holds no special aura to them.
Trying to recall if Watchtinker had ever mentioned a Cal. 321 that was done in a silver finish...
Cheers, Al
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