Russia Silver 1911 СПБ ЭБ 15 Kopeks Y#21a.2 Grades xf. 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, FinlandСПМ St. PetersburgTM Feodesia, CrimeaIn addition there a few years that pieces with no mint mark can be found.