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The owner is thinking about removing the gold plate. He thinks this was done in the 80s so should be steel. Not sure who could get it back to originals state these days?
No, that's not correct. The case-back says "stainless steel back" which means that the case itself is plated. If the case were all stainless, the back would say only "stainless steel". There is base metal underneath the gold plate. This is vintage watches 101.