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Here are the NGC “book” values for the coin. Often actual prices achieved are lower than book values. The most accurate price would be from checking EBay sales for the coin in similar condition. Personally I would grade this one as F-VF (maybe F+).
https://www.ngccoin.com/price-guide/world/russia-50-kopeks-y-83-1921-1922-cuid-1086570-duid-1523260
Here are some related coins that sold on EBay
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=1921+russia+coin+50+kopeks+&_sacat=0&LH_TitleDesc=0&rt=nc&_odkw=1921+russia+coin+50+kopeks+1921+sold&_osacat=0&LH_Sold=1
Hi.
I'd say it's worth about $15-25. It's rather beat up, and these are relatively common.
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