Польша
The stamp exists also with the watermarks:
- Posthorn Type 2 Multiple [SR] - III-4
- Posthorn Type 2 Multiple [Rev, SL] - III-6
- Posthorn Type 2 Multiple [SR] - III-4
- Posthorn Type 2 Multiple [Rev, SL] - III-6
| Страна: | Польша |
| Тип: | Почтовые марки |
| Серия: | 15th session of the Council of Mutual Economic Assistance |
| Номинал: | 40 gr |
| Год: | 1961 |
| Размер: | 40 x 26 mm |
| Перфорация: | comb 12¼ x 12 |
| Тираж: | 840,000 |
15th session of the Council of Mutual Economic Assistance
 Emblem |  Map with oil pipe line from Siberia |