ruger single six revolver

I have ruger single six revolver. It is a super .22 , catalog No. NR-4 45/8 Bbl. the number on the side is 64-43065.
I would like to know what this is worth as it is in excellent condition.

hello,,the ruger single six can be dated at the strum ruger site..try this link http://www.ruger.com/service/productHistory.html# ,,the early models were made from 1953-1971 and the newer ones are still being made to my knowledge ,,the older versions will bring 250-350 and the newer models usually sell in the 175-250 range ,,
bigcurt