Stamps of Mongolia, 12.25x11.5 perf
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1978, Mar 25 75th Anniversary of Powered Flight issue unwmk p. 12.25x11.5
| - | 50m | multi | Charles Lindbergh and "Spirit of St. Louis" | |||
| - | 80m | multi | Tschakalow | |||
| - | 1.20t | multi | Wright brothers | |||
| - | 4t | multi | — | — |
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