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USA. Proof 1 Dollar 2010 S, San Francisco, 15th President James Buchanan - PCGS PR 69 DCAM, KM 477, manganese brass plated copper (77% copper, 12% zinc, 1% other on pure copper core), 26,50 mm, weight 8,10 g., Designer: Joseph Mena / Don Everhart, Condition PCGS PR 69 DCAM, special dedicated PCGS label