And maybe post in the vintage forum?
If the color of the bridges is mismatched, there are probably replacement parts from a different movement. This is pretty common when repairs were needed. Different platings were used in different movements. Not stainless obviously, but rhodium, copper, gold, and other alloys apparently. There are quite a few threads on the topic. Plating is sometimes damaged during cleaning of course, but it's not likely that the plating was damaged on only one bridge.
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