Stamps of German Democratic Republic, flying machines design type, missing design, not overprinted
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postage
1990, Feb 20 flying machines unwmk (no perf info)
| - | 50pf | multi | 1: Draft swing-wing aircraft by Melchior Bauer-Historic Aircraft European airmail exhibition Lilienthal 2: Swing-wing aircraft by Albrecht-Ludwig Berblinger-Historic Aircraft European airmail exhibition Lilienthal | |||
| - | 90pf | multi | Glider by Otto Lilienthal-Historic Aircraft European airmail exhibition Lilienthal |
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