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The numbering in brackets below the main one is taken from the Catalog of Bulgarian Postal Entities, Part I, Postcards (1879-2007) by Bulphila Publishing House and the Michel Catalog. |
| 1923 year. | Detailed full catalog for 1924 year. | 1925 year. |
| BC number(s): k19241 (PC 56), k19241 карта, k19241 отговор, "Postcard with answer" |
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| BC number(s): k19242 (PC 57 a), " Boris III " |
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| BC number(s): k19243 (PC 57 b), " Boris III " |
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| BC number(s): k19244 (PC 57 c), " Boris III " |
| 1923 year. | Detailed full catalog for 1924 year. | 1925 year. |
