Graf Zeppelin Iceland Flight cover
This combination flight cover traveled on three kinds of aircraft between Hawaii and Friedrichshafen, Germany: a non-rigid airship (blimp), a fixed-wing airplane (with no distinction made for the floatplane), and a rigid airship (dirigible). The cover is a U.S. 5-cent airmail entire uprated with a 25-cent U.S. definitive (Fourth Bureau issue) and Germany RM2 1930 zeppelin stamp.
This was carried from Honolulu by the ship SS City of Los Angeles eastbound, picked-up at sea by Goodyear airship (blimp) Volunteer for "First Pacific Coast Ship-to-Shore Air Mail Transfer" (large printed red cachet on left face and green handstamped cachet on reverse "First Ship-to-Shore Experimental Flight / Airmail / Chamber of Commerce / San Pedro California") and flown to the San Pedro, California Post Office, where U.S. stamps were cancelled with the San Pedro double oval and San Pedro transit postmark June 12, 1931, applied, tying the German stamp.
It was then forwarded by U.S. domestic airmail service to New York where it was sent on the North German Lloyd liner Europa departing from New York June 20, 1931 (Deutsch-Amerikanische Seepost hand cancel on German stamp). While at sea, it flew by catapult airmail flight (918 km) on June 24, 1931 from the Europa to Southampton (blue oval pictorial flight cachet lower right face). Onward air transmission was by DLH from Croydon Airport (London) to Köln and Stuttgart (red rectangular airmail receiving cachet low center face and June 25, 1931 transit roller cancel on reverse) from where it was forwarded to Friedrichshafen.
Finally, the cover dispatch was postmarked in Friedrichshafen June 30, 1931, and flown on the LZ-127 Graf Zeppelin Iceland Flight (departed 0535 GMT that date) and dropped at Rykjavik on July 1, 1931 (postmark on reverse). It returned to Friedrichshafen by surface.