Very nicely preserved piece, beautifully preserved details, slight rubbing on the eagle's belly, colorful patina.
Variety with an eagle with straight paws in the shield of the coat of arms.
Obverse: crowned escutcheon with the coats of arms of the Crown and the Grand Duchy of Lithuania, above it in a half-arc the legend:
KROLESTWO POLSKIE; below the shield initials K-G- Karol Gronau - administrator of the Warsaw Mint in 1829-1834;
Reverse: in an oak wreath the inscription 3/GROSZE/POLS-/1831;