If memory serves me correctly these were marked as Model 27 for the N frame and Model 27k for the K frame. 4 and 6 inch models were available. In my area we bought them because we couldn't afford a Hoyt holster. Yours is the first I've seen in brown. They are heavy. Only a youngster would carry a Model 28 6 inch in one for an 8 hour shift. I really liked mine until I was shown a gun snatch technique taught in jails. Really opens your eyes when you see that the bad guys practice too.
The Judge was a variation with a recess to try and lock the cylinder in place.