| Added by |
 Maciej Pasztor
|
| Face value | 20 (heller) |
| Catalog code (Michel) | Porto 17 |
| Catalog code (Scott) | POSTAGE DUE J26 |
| Catalog code | Polish Stamps Catalog D17 (Znaczki dopłaty) |
| Series | Numerals of value for southern Poland |
| Place in series | 5 |
| Stamp colour | Dark blue |
| Stamp use | Postage Due stamp |
| Print run | 1,299,000 |
| Issue date | 10/09/1919 |
| Designer | Władysław Skoczylas |
| Paper type | White; Thick Smooth or thin laid paper |
| Print technique | Typography |
| Printed by | Drukarnia Poczty i Telekomunikacji Warszawa |
| Perforation | 11½ (line) |
| Height | 18.00 mm |
| Width | 18.00 mm |
| Catalog prices | No catalog prices set yet |
