Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Canada - Zeppelin Flight - 1936 (May 20-23), Hindenburg Second NA Return Flight pre-printed cover (The General Brook (Hotel) Niagara Falls. Canada), addressed to Munich, franked by two stamps of the Pictorial issue, tied by Niagara Falls ''MY.19.36'' date stamps, bilingual ''By Air Mail'' label and endorsement ''With Airship ''Hindenburg'' to Germany'', no backstamp, fresh, VF and rare, expertized by Roger Koerber, Sieger #411C, C.v. €500, Est. $500-$600, Scott #223, 226