I have great interest in Russian coins. The type series is not too hard or expensive to complete if you forget about gold, platinum and commemoratives. There's the challenge of the lettering, which can be overcome (especially if you have dabbled in mathematics), but also some of the smallest and largest circulating coins in my collection.
Here is my latest purchase. It's harder to find, because it is a pretty useless denomination. In this period, the czars issued portrait coins of a rubel and fractions and generic silver coins from 5 to 20 kopeks. The whole series of Alexander III counts 13 different denominations plus gold. The edge says: 1 zolotnik 5,25 dolei pure silver.
Alexander's coins remind me of an old joke (sorry, it works only in German, Taten = Vater): Was ist der Unterschied zwischen Rothschild, Kaiser Wilhelm II und Zar Nikolaus II? Rothschild hatte einen reichen Taten, Kaiser Wilhelm einen tatenreichen Taten und der Zar einen attentatenreichen Taten...
Peter