Hi rlmstamps2012, that banknote is Russian, 250 ruble, 1917, and looks in nice condition for over 100 years old. Maybe worth $5-$10, from a very interesting time in Russian history. I'd keep hold of it.
Thank you ScotsGreyhound! It was in with some Assyrian papers. I will likely display it in a stamp album or maybe a small frame. I see a lot of 100 year old stamps that have seen harder lives than this banknote.