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Very Affordable 5-Coin 1971 U.S. Proof Set -- One of the first San Francisco Mint proof set issues with a mintage of 3.2 million & "Best Buy of Decade" 5-Coin 1992 U.S. Proof Set -- 2.7 million mintage in superlative proof quality, with deep-etched frosted engravings and mirror backgrounds.
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