1887, pre-printed cover, the text reads: "Airship Construction Department. Russia", the Head of the Department was Prof. Dmitry I. Mendeleev, the cover franked by 7k blue and sent from St. Petersburg to Berlin, addressed to Hermann Moedebeck, Aeronautics Pioneer, all appropriate markings, VF and undoubtedly unique aerophilately postal history item Est. $3,000-$5,000
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