(Naval Blockade) 1863 (Aug. 18) Philadelphia Pa. To "Fleet Captain, Flagship 'Minnesota', Norfolk Va.", cover bearing vertical 1¢ blue (63) strip of three tied by two strikes of "Philadelphia Pa Aug 18 1863" cds, Very Fine and choice, ex-Emerson, Grunin, Lee. Estimate  $300 - 400. The U.S.S. "Minnesota" was part of the South Atlantic blockading squadron. $0 (Image)