齿孔: line 10¾ or 11.
Irregular line perforation with a diameter of perforation holes A: 0.05-0.07 cm, B: 0.08-0.1 cm, C: 0.11-012厘米.
颜色: 一个: dark carmine red; d: carmine brown
From November 6, 1950, the regulations required the use of stamps with denominations in new zlotys but the new stamps were not prepared on time.
Therefore it was decided that stamps would be overprinted with the words "gr", "groszy" 或者 "grosze".
The overprints were made by hand in various colours.
