Gold capping is a thick layer - 200 to 300 microns and usually about 240 for Omega. In comparison, gold plating is anywhere from 10 to 80 microns - usually 20 for Omega but 40 on a few cases.
I like solid gold for one reason: if the bottom drops out of the vintage watch market (see baseball cards, postage stamps, Beanie Babies, etc.) you still have the value of the scrap gold.
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