A nice, fully legible piece of the Catherine II ruble.
Patina, tarnish.
On the reverse, initials of Stefan Afanasyev - St. Petersburg mincmaster from 1764-1770.
Obverse: bust of the Tsarina to the right, below her the mint mark СПБ, in the rim the legend:
Б-М-ЕКАТЕРИНА-II-IМП-IСАМОД-ВСЕРОС;
Reverse: eagle of the Russian Empire, on the sides of the tail initials C-A, in the rim legend:
1764 МОНЕТА - РУБЛЬ-;