Poland
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
| Country: | Poland |
| Type: | Postage stamps |
| Series: | 15th session of the Council of Mutual Economic Assistance |
| Nominal: | 40 gr |
| Year: | 1961 |
| Size: | 40 x 26 mm |
| Perforation: | comb 12¼ x 12 |
| Mintage: | 840,000 |
15th session of the Council of Mutual Economic Assistance
 Emblem |  Map with oil pipe line from Siberia |