Poland
| Country: | Poland |
| Type: | Postage stamps |
| Series: | Shipbuilding Industry |
| Nominal: | 4 zł |
| Year: | 1961 |
| Size: | 81 x 27 mm |
| Perforation: | comb 11¼ |
| Mintage: | 601,200 |
Shipbuilding Industry
 Trawler B-15 0.22$ |  Fisher's base B-62 |  Coastal m/s B-471 |  Motor freighter B-55 |
 Motor freighter B-54 |  Motor tanker B-70 2$ |