Russia Silver 1915 ?? 15 Kopeks Y# 21a.3 Grades Choice+ Unc. About the Kopek, 100 Kopeks make 1 Ruble. To give an idea of the purchasing power of one of these in the 1790's one could purchase 50 apples for a Kopek, so these kopek pieces did have some nice buying power.The mintmarks available on these coins are:AM AnnenskEM EkaterinburgKM KolyvanMM MoscowCM Sestroretsk, Finland??? St. PetersburgTM Feodesia, CrimeaIn addition there a few years that pieces with no mint mark can be found.