A nice, fully legible piece of the ruble of Catherine II.
Obverse: bust of the Tsarina to the right, underneath it the mint mark СПБ, in the rim the legend:
Б-М-ЕКАТЕРИНА-II-IМП-IСАМОД-ВСЕРОСC;
Reverse: eagle of the Russian Empire, initials on the sides of the tail, legend in the rim:
1791 МОНЕТА - РУБЛЬ-;