| Added by |
 Maciej Pasztor
|
| Face value | 20 groszy |
| Catalog code (Michel) | 961 |
| Catalog code (Scott) | 721 |
| Catalog code | Polish Stamps Catalog 817 |
| Series | Polish ships |
| Place in series | 3 |
| Stamp colour | Deep ultramarine |
| Stamp use | Definitive stamp |
| Print run | 107,899,890 |
| Issue date | 16/03/1956 |
| Designer | Stefan Łukaszewski Grav: Bogusław Brandt |
| Paper type | White; Middel Smooth |
| Print technique | Steel engraving |
| Printed by | PWPW (Państwowa Wytwórnia Papierów Wartościowych) |
| Perforation | 12½ x 12¾ or 11¼ x 11¾ (harrow) |
| Catalog prices | No catalog prices set yet |
