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August 26, 2016

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David Hall, co-founder of Professional Coin Grading Service, with some of the 1,427 Gold Rush-era U.S. gold coins at his office in Santa Ana, Calif., on Tuesday, Feb. 25, 2014.

Reed Saxon / AP

David Hall, co-founder of Professional Coin Grading Service, with some of the 1,427 Gold Rush-era U.S. gold coins at his office in Santa Ana, Calif., on Tuesday, Feb. 25, 2014.