http://www.cbr.ru/eng/bank-notes_coins/mem...=070402_eng.htm
Firstly the commemorative of Leonard Euler (300th anniversary of his birth), a Swiss mathematician who lived most of his life in Germany and Russian and later loved the country so much that he died there in St. Petersburg. Euler is famous for his wide area in mathematics and especially the sigma notation which is noted on the coin. (If you hate maths, well you know who to blame
Now what puzzled me is the history of Bashkortostan. (no no, no bashing time
And I had to check what is the fuss of Bashkortostan is all about: http://en.wikipedia.org/wiki/Bashkortostan Seems like a nice place.
Now collecting bi metal coins can be extremely challenging as there are so many subdivisions: http://en.wikipedia.org/wiki/Subdivisions_of_Russia