A very nice example of this issue, with well-preserved details.
Gloss on both sides partially hidden under patina.
Obverse: bust of the Tsarina to the right, mint mark СПБ below her, legend in the rim:
Б-М-ЕКАТЕРИНА-II-IМП-IСАМОД-ВСЕРОC;
Reverse: eagle of the Russian Empire, on the sides of the tail the initials of the mincemaster, in the rim the legend:
1770 МОНЕТА - РУБЛЬ-;
