From Bowens web site:
NEW MODEL FIELD SIGHT
$119.95
Fits New Model single-action revolvers including the Single-Six, Blackhawk, Super Blackhawk, Bisley and double action revolvers including the standard Redhawk and .454/.480 Super Redhawks. Please note: some early transitional single-action New Models may need the OMF part.
This sight is brand new and has has never been installed on a revolver. I'll sell it for $110 shipped. Save $10 plus sales tax and shipping fees. I do have two photos. PM me your email and I'll send them.