Micronesia 233 ah block

Micronesia 233 ah horizontal or vertical block, MNH, $9.50. Michel 440-447. Pioneers of Flight 1995. Hugh C.T. Dowding, William Mitchell, John K. Northrop, Frederick Handley Page, Federick H. Rohr, Juan T. Trippe, Konstantin E. Tsiolkovsky, Ferdinand Graf von Zeppelin.