whats the realistic value of a used super blackhawk?

[O4L]

tR, one of the differences between the SBH, and the SRH is that the SBH is western style single action, while the SRH is a modern style double action revolver.

The SRH like you have , is generally worth $200-$250 more than the new model SBH.

The "three screw" version is one of the old model SBHs.

"From 1962 through 1972, Ruger made the "Three Screw" Blackhawk in various calibers, so called by the number of screws visible on the side of the revolver."