FWIW, I've seen a number of this type of watch (roughly same age, size and "type") patinate in the same manner. Only really noticed it after buying the one pictured above, but they are out there. I would hazard a guess that they are probably made by the same manufacturer and that the decolouration is due to faulty lacquer. I, ahem, might have been one of those spreading the tobacco theory, but I am slowly moving away from it...
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