Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Poland - Zeppelin Flight - 1936 (May 6-9), Airship ''Hindenburg'' 1st North America Flight registered cover from Warsaw, franked by four stamps, red letter ''d'' (Frankfurt) flight marking, NYC ''5.9.1936'' arrival ds, VF, Sieger #406, C.v. €350, Est. $200-$250, Scott #286, 300‑01, 303