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The 1964 proof set was the last year regularly circulating coinage was offered in proof condition until the silver proof sets of the 1990s.
Beginning in 1965, the major denominations went to a copper-nickel clad composition. Even the half dollar was reduced to a 40% silver composition in 1965.
The 1964 proof set is one of the most popular proof sets and among the most affordable of the silver proof sets.
A 1964 proof set can be bought for anywhere from about $14 to $20 from most coin dealers.
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