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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. |
| 1885 year. | Detailed full catalog for 1886 year. | 1887 year. |
| BC number(s): k18861 (PC 5 a), "Open Letter" (postal card) - gray-green inscriptions |
| 1885 year. | Detailed full catalog for 1886 year. | 1887 year. |
