Poland under Russia, Nicholas I, 1-1/2 rouble=10 zloty MW, Warsaw

A natural, circulating piece.

Obverse the eagle of the Empire, at its tail the initials MW, in the outer rim the legend:
ЧИСТАГО СЕРЕБРА 6 ЗОЛОТНИКОВЪ 31 1/2 ДОЛЕЙ;

Reverse: in laurel and oak wreath inscription:
1 1/2/РУБЛЯ./10/ZLOT-/1837;