As written in the 20th Century Krause coin catalogue:
During the late 19th and early 20th century Russian law provided that gold mine owners who supplied gold to the mints should receive back whatever silver was recovered during the refining of the gold. This silver was returned in the form of circular ingots of various weights which resembled coins.
This was the largest of the circular ingots - Weight: 42.6 grams 0.990 silver. Very scarce
The face value is 10 Zolotniks - this is a weight and NOT a denomination.
Very scarce and rarely offered for sale in this country.