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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. |
| 1886 year. | Detailed full catalog for 1887 year. | 1888 year. |
| BC number(s): k18871 (PC 6 a), "Open Letter" (postcard) |
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| BC number(s): k18862 (PC 6 b), "Open Letter" (postcard) |
| 1886 year. | Detailed full catalog for 1887 year. | 1888 year. |
