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bank poccnn is actually "Bank Rossii", Bank of Russia, with cyrillic writing.... So it's rubles, and 500 rubles = $18.7, today's rate.

Edit: The actual characters should be something like:

Банк России (with inverted N).

I am afraid that you might have trouble to change it in USA, you might have to go either to Russia or to another former Soviet Republic for that (Ukrain, Lithuania, etc.)...