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The 20th Century Gold Series Set of proofs consists of the 8 issues made in proof for the $2-1/2 Indian, $5 Indian, $10 Indian, and $20 St. Gaudens series. These proofs were issued from 1908 to 1915. They have long been collected as "Matte Proof Gold" sets, but this is somewhat of a misnomer in that while the 1908 and 1911 to 1915 issues were Matte proofs, the 1909 and 1910 issues are actually Roman Finish proofs.
Each of the four 8 coin series is a challenge and the combined complete set is a difficult set to assemble. Some of the issues have original mintages as low as only 50 coins struck. The key dates in each series are the 1914 and 1915, along with the 1909 and 1910 Roman Finish proofs. But all of these 32 coins are truly rare.