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Rocket Mail of the WorldGermanyHanover, Germany %u2014 April 26, 1968 %u2014 EZ-86C1 %u2014 H.O.G. (Hermann Oberth-Gesellschaft).Reduced facsimile of back, below.(Cachet text) Airmail Letter Aerogram. Hermann Oberth Society and Research and Development of the Waltraum eV (formerly the German Rocket Society eV).(blue rubber stamp) Flown with a rocket from the Hermann Oberth Society%u2019s experimental test series 3/68 and sent to the special post in Hanover of the Deutsche Bundespost for delivery by post (illegible).(text on back) According to the provisions of the Universal Postal Treaty, the airmail letter does not contain any inserts. German air show. No. 738.