>From latest USPS catalog, describing 25 different stamps selected for preservation in silver/gold form: "All stamp ingots are minted on mirror-polished .999 fine silver blanks that are a full 2mm thick...after each piece is struck and inspected, the delicate perforations are diamond-cut, and each piece is generously layered in 24-karat gold." No details given on thickness of "generously layered". The 3ยข stamp measures 1-1/8" X 1-3/4". $69/each, including shipping and insurance. Might make for interesting cathode experiments. jr
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