A bit more posts than I figured on. Sorry for the slow response. A couple of questions, to answer. The 5 T Smiths revolvers have; a target front partridge sight, larger rear adjustable sight, large hammer spur, wide target trigger and the extra screw in the action plate under the grip. This 6" M-19 also has the early M-19s recessed chambers in the cylinder and pinned barrel.
The black parkerizing is a bit different, we would take an as new gun, prep it, parkarize it, then black hot blue it, this process turns the parkerizing jet black and makes it very hard. However, the process ruins the blueing salts so the tank then must be cleaned out with the salts and water changed out..
At Steve Brady's shop in Destin and later the Great Guns shop in Pensacola, we used to do these as the the last guns to go in the blueing tanks before we had to change the salts. These guns were normally owner or employee owned guns as the process was not a listed offering to the general public. Good eye spotting that black parkerizing finish by the way.
This is the Mountain Rose Leather Co., hand tooled leather flap holster for the 6" Smith gun. Works well when worn on a tractor if bush hogging brush, to protect the gun. The man and wife team from Mt Rose moved from NM to Crestview, FL, very nice folks, if you recognize the name.