Thinking of selling, whats it worth? Gallager conversion.

I have a Ruger old model, 3 screw.  It was a 6 inch 357 magnum.  I had it converted several years ago by John Gallager.  He cut a Super Blackhawk barrel down to 4 1/2 inches and remounted the front sight.  Top end and cylinder was reblued.  Bottom (grip)  in original.  I'll try to get some pictures.  What is it worth?