Ah the Shooting Master. That's the one on the Colt New Service frame?
Never liked Colt revolvers, in truth, although owned a Trooper III (my first brand new to me revolver) and a Colt Detective Special. Didn't like the way the frame rotated in the hand under double action fire. If only, if only, they'd made them with a "hump". Always wanted a Lawman III with 2" barrel. Until I handled one! Sold the Colt Trooper III and got a Model 27 and never had anything other than Smiths after that.
Latest one we've seen here at our range is a Colt Commando that came complete with its wartime instruction leaflet.