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Since 1951, the U.S. Mint has issued separate proof sets and mint sets every year, with the exception of the 1965-1967 span. This transitional period fell between the last Philadelphia Mint proof set of 1964 and the first San Francisco Mint proof set of 1968. During these years, the U.S. Mint replaced proof sets with a higher-quality form of mint sets. Like previous proof sets, each "special mint set" contained all five coin denominations for the date: cent, nickel, dime, quarter and half dollar (the 40% silver Kennedy type). These "hybrid" sets had mintages of just 1.9 to 2.4 million.
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