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Pioneer Flight Covers 1887, pre-printed cover with text at top reads: "Airship Construction Department. Russia" (Prof. Dmitry I. Mendeleev was the Head of that Department), the item franked by 7k blue and sent from St. Petersburg to Berlin, addressed to Hermann Moedebeck, an Aeronautics Pioneer, all appropriate markings, VF and undoubted aerophilately rarity
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