Back in the mid Eighties I had a Ruger Super Blackhawk .44 Mag,7 1/2 " black finish. I took it to a local (Clearwater, Fl) gun coating shopo named Accurate Plating, There, it was cut down to 5 1/2", barrel was crowned and finished in brushnickle. It looked just like your pistol. Since then the shop moved, I believe to North Carolina. The person who did mine was Kevin Cogan.