Re: silver on silver?
The easiest and most economical process to increase the outer diameter would be to remove the silver plate from the brass, polish the brass, clean well to make sure all buffing compound is removed, reactivate the brass in 10% sulfuric acid, plate nickel to desired thickness, then immediately flash silver plate over the nickel. I would assume that the silver plate is thin so should be able to chemically or mechanically remove the silver plating with no problem.
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