Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Soviet Union - Catapult Flight - 1933 (September 22-October 2), Leningrad - Berlin Pioneer Flight registered cover with mixed Soviet Union and German franking forwarded to USA by S.S. Bremen and delivered with Catapult Flight, Berlin Luftpostamt transit and NYC appropriate arrival markings, VF and rare, Est. $600-$700