Philately. ZEPPELIN / Zeppelin-letter, transported by LANDUNGSFAHRT NACH AGYPTEN - return flight, franked with airmail 27Mill with overprint 100Mill / GRAF ZEPPELIN AVRIL 1931 ( Sie.105By); CDS ALEXANDRIA GRAF ZEPPELIN 10.4.1931; very nice letter, favourite franking (Image 1) (Image 2) (Image)