Air Mail cover 1913 (Nov.) Liegnitz Dirigible Base (-) red-brown on yellow, affixed to 1913 (9 Nov.) flown card cancelled by "FLUGPOST/A.D. KATZBACH" special c.d.s. (9.11) as well as regular Liegnitz machine d.s. (same date), violet "Sachsen" and "Hamburg-Amerika Linie/Abtlg. Luftschiffahrt" cachets adjacent. Fine and rare. Signed Bloch. M. 11, DM.7000. Photo

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Air Mail cover 1913 (Nov.) Liegnitz Dirigible Base (-) red-brown on yellow, affixed to 1913 (9 Nov.) flown card cancelled by "FLUGPOST/A.D. KATZBACH" special c.d.s. (9.11) as well as regular Liegnitz machine d.s. (same date), violet "Sachsen" and "Hamburg-Amerika Linie/Abtlg. Luftschiffahrt" cachets adjacent. Fine and rare. Signed Bloch. M. 11, DM.7000. Photo