1. Alcoholics are mocked and tormented when they can not scrounge the kopek needed for their next drink.

2. On the exchange of the Gosbank (State Bank) of the USSR, 100 Afghanis were equal to 2 rubles, 1 kopek (April 1970).

3. In 1860, silver 15 kopeks were introduced, due to the use of this denomination (equal to 1 złoty) in Poland, whilst, in 1869, gold 3 rubles were introduced.