Russia, Nicholas I, Ruble 1842 MW

A nice piece of the first vintage of Warsaw rubles.

Variety with a broad eagle tail.

Obverse: crowned eagle of the Russian Empire, on the sides of the tail the initials MW, in the rim the legend:
ЧИСТAГО СЕРЕБРА 4 ЗОЛОТНИКА 21 ДОЛЯ;

Reverse: in laurel and oak wreath crowned inscription:
МОНЕТА/РУБЛЬ/1842;