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| 1927 year. | Detailed full catalog for 1928 year. | 1929 year. |
| BC number(s): 218, 219, "Air mail overprints" - red overprint on BGN 2 BK 204, green overprint on BGN 10 BK 208 - two postage stamps. |
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| BC number(s): 220, 221, 222, "Overprints for air mail with changed colors" - 1 BGN brown-red overprint on 6 BGN BK 207, green overprint on 4 BGN BK 206, dark blue overprint on 10 BGN BK 208 - three postage stamps. |
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| BC number(s): 223, 224, 225, "Regular - 10 years since the accession of Tsar Boris III." - three postage stamps. |
| 1927 year. | Detailed full catalog for 1928 year. | 1929 year. |
