Surcharge on Mi:PL F486.
Stamp from souvenir sheet Mi:PL BL10.
From November 6, 1950, the regulations required the use of stamps with denominations in new zlotys but the new stamps were not .. Смотреть далее »prepared on time.
Therefore it was decided that stamps would be overprinted with the words "gr", "groszy" or "grosze".
The overprints were made by hand in various colours.
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