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desc_issuer: United States desc_year: 1851 desc_denom: 12c Related descs: issuer=United States-1850 issuer=United States-1852-1c Not used by any overprinted stamps. Matches 1 type: United States postage 7/1/1851 12c blk issue=1851 d=Washington (1851 12c) unwmk imperf |