Stamps of Bulgaria, International Exhibition of the Works of Youth Inventors issue
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postage
1985, Sep 23 International Exhibition of the Works of Youth Inventors issue unwmk p. 13
| X | 5st | multi | Computer Image of a Boy | |||
| X | 13st | multi | Computer image of a teenager | |||
| X | 30st | multi | Computer Image of a Cosmonaut |
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