International Society of Postmasters, World's first stamps, gold on silver proofs of the Franklin Mint, 74 reproductions in sterling silver with a layer of gold leaf, complete with cards in English and French with details of the first issues, with one additional reproduction of US no 1. Stored in a large luxury cassette; some of the reproductions have developed dark sport. According to our information, 600 g. of 92.5% silver.
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