7th national philatelic exhibition in Warsaw 4+2 zł — Poland, 1957
7th national philatelic exhibition in Warsaw (Poland, 1957), face value 4+2 zł. Photo, catalogue value, details and photo identification.
- Issue date
- 1957
- Face value
- 4+2 zł
- Colors
- Prussian blue
- Print run
- 460,700