When I was a little younger, I used to get catalogs from Robert Abels, in New York, an antique arms dealer.
In one catalog was a Colt Single Action, belt, holster, death warrant and a few other artifacts, all pertaining to Black Jack Ketchum.
My wife and I probably drove down that road in the picture, driving around out of Tucumcari, NM several years back. There was a marker about where he was caught.
Bob Wright