Germany 1930 Graf Zeppelin Netherlands Flight Signed Sammt Eckener Lehmann Postcard

Postcard franked with 1m green, tied by Graf Zeppelin on-board cancel (11 Nov), corresponding boxed violet and blue illustrated confirmation cachet, signed on front “Albert Sammt” and on back “Knut Eckener” and “Albert Lehmann”, reverse of card with printed poem honouring Dr. Hugo Eckener (translation included), an ideal item for the Zeppelin enthusiast, scarce and fine; Albert Sammt was an engineer and Knut Eckener (son of Dr. Eckener) a helmsman on the Graf Zeppelin, while Albert Lehmann was a steward