Stamps of Bulgaria, 15 Apr 1981
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postage
1981, Apr 15 100th Anniversary of Ship Building in Bulgaria issue unwmk p. 13
| - | 35st | multi | Passenger ship Georgy Dimitrov | |||
| - | 43st | multi | Cargo ship Petimata ot RMS | |||
| - | 53st | multi | Tanker Khan Asparuh |
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