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Once unpopular with the coin collecting public, Special US Mint Sets from 1965, 1966, and 1967 have gained momentum as some of the top US Mint strikes during that time period. These coins differed in that the US Mint stuck them once and not twice as Proof coins are. However, these Special US Mint Sets were struck on high-tonnage presses. Some of the coins did result in a full mirror finish and Proof like appearance. The Special Mint Sets present a good opportunity for collectors looking for variety. For instance, a collector can find a number of the 1966 Kennedy Half Dollars, which has a large number doubled dies, among the Special Mint Sets.