Stamps of Bulgaria, 14 Oct 1977
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postage
1977, Oct 14 Visit of Nikolai Pirogov in Bulgaria issue unwmk
| X | 13s | multi | Dr Pirogov, p. 13 | — | — | |
| - | 13s | multi | imperf | — | — |
airmail
1977, Oct 14 20 Years artificial Earth Satellites issue p. 13.5x13
| - | 12s | multi | Astronauts in Space Earth Hemisphere | |||
| - | 25s | multi | American Space Probe Mariner 6 Planet Mars | |||
| - | 35s | multi | Soviet Space Probe Venera-4 Planet Venus |
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