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postage
1931, Apr 1931a issue unwmk (no perf info)
| X | 12l | brn | Tsar Boris III |
1931, Sep 18 Balkan Games 1931 issue p. 11.5
| - | 12l | bl |
1933, Jan 5 Balkan Olympics changed colors issue
| - | 12l | org | swimming |
1996, Jul 30 crustaceans (1996 Bulgaria) p. 13.25x13
| - | 12l | multi | Astacus astacus |
1996, Sep 24 Old steam engines issue p. 13
| X | 12l | multi | Steam engine 1848 | — | — |
airmail
1931, Oct 28 1931 air issue p. 11.5
| - | 12l | car | dove delivering message to woman |
1938, Dec 27
| - | 12l | bl | dove delivering message to woman |
1940, Jan 15 1940 air issue p. 13
| - | 12l | dlbrn |
1946, Jun 15 1946 air issue
| - | 12l | yelbrn |
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