I could be wrong (and often am) but I believe the case is plated. That discoloring is “brassing” where the plate coat is wearing thin and the base metal showing through. A solid gold case would have hallmarks indicating at a minimum, the gold quality. You’d also expect an Assay mark from country of origin and depending on the country an import stamp.
Herodia rose gold watch: what does caseback marking mean?
I own a vintage Herodia handwound watch with a rosegold(plated?) case. There are no hallmarks visible on the case, the caseback or the inside of the caseback where you can usually find details on the quality/type of gold used. There is however a 90 in a square stamped on the caseback (90, not 9C). I've seen this on other gold Herodia watch casebacks on the internet but I can't find out what that 90 means. Can somebody enlighten me? Thanks in advance.
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