Russia, Nicholas I, Rouble 1840 НГ

A nice piece of ruble minted during the administration of mincmaster Grachev.

Variety with an eagle with 9 feathers.

Obverse: eagle of the Empire, between its legs and tail the initials НГ, in a rope border, in the outer border an inscription beginning with a rosette:
ЧИСТAГО СЕРЕБРА 4 ЗОЛОТНИКА 21 ДОЛЯ;

Reverse: in a laurel and oak wreath crowned inscription:
MOHETA/РУБЛЬ/1840/СПБ;