| Added by |
 Maciej Pasztor
|
| General Description : | Counterfeits exist. Owerprint:: Red: stamp 280 (Scott) Black: stamp 281 |
| Face value | 20 & 30 Groszy |
| Catalog code (Michel) | PL 285 & 286 |
| Catalog code (Scott) | PL 280 & 281 |
| Catalog code | Yvert et Tellier PL 373A & 373B Stanley Gibbons PL 297 & 298 AFA number PL 294 & 295 Polish Stamps Catalog (Fischer) PL 264 & 265 WII.L |
| Series | Katowice Philatelic Exhibition. |
| Stamp colour | grey & deep pink |
| Watermark | Posthorn Type 1 Multiple [SL] |
| Stamp use | Commemorative stamp |
| Print run | 40,800 each |
| Issue date | 01/06/1934 |
| Designer | Zygmunt Kamiński |
| Paper type | White |
| Print technique | Typography |
| Perforation | 12 x 12½ harrow (polish stamps catalog) |
| Height | 26.00 mm |
| Width | 22.00 mm |
| Catalog prices | No catalog prices set yet |
