Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - El Salvador - Zeppelin Flight - 1936 (June 19-26), Airship Hindenburg 3rd North America Return Flight registered postcard to Germany, franked by three stamps, including two air post values, tied by special ''17.JUN.1936'' postmark in green, New York ''6-19. 1936'' connection on reverse and Frankfurt ''26.6.36'' receiver on front, mostly VF, Sieger #419, C.v. €750, Est. $400-$500, Scott #547, C12, C44