A nice piece. Very well preserved details.
Obverse eagle of the Empire, at its tail the initials НГ, in the outer rim the legend:
ЧИСТАГО СЕРЕБРА 6 ЗОЛОТНИКОВЪ 31 1/2 ДОЛЕЙ;
Reverse: in laurel and oak wreath inscription:
11/2/РУБЛЯ./10/ZLOT-/1833...;