Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - Zeppelin Flights - 1936 (June 23-26), Airship ''Hindenburg'' 3rd NA Return Flight illustrated mixed franked cover, bearing Roger Williams' Statue 3c purple, tied by machine Lakehurst ds and uprated by German Zeppelin 75c green, cancelled on-board ''24.6.36'' marking, mostly VF, Sieger #417C var, mixed franked items are not listed either in Siegel or Michel, Scott #777