A nice piece. Rarely listed issue on the market.
In the latest edition of Jakubowski's specialized catalog of 2020, the issue rated at the R7a rarity grade, which means that the type was known to the author in the number of 6 to 10 pieces, so it is rarer than the 50 penny, 1 and 5 zloty denominations practically uncommon in the trade.
Patina, tarnish.
Obverse: 10 P./UŁANÓW, in the rim SPÓŁDZIELNIA SPOŻYWCÓW;
Reverse: tied denomination: 10 GR, in the rim M-A-R-K-A/O-B-I-E-G-O-W-A;