Those target 60 revolvers bring back memories from the early 1960 era. A deceased friend, custom built similar type revolvers to your 'target' mod. 60s. He had the topstrap of 1 7/8" Mod. 36 S&W revolvers milled to accept S&W adjustable rear sights. I presume they were Mod. 34 sights. I don't remember how he raised the front sight to the needed matching height, but the end result, was a beautiful belly gun, with adjustable sights. Those custom built revolvers only appealed to a few people, I was one of them, as I prefer all of my firearms to have adjustable sights. I wasn't able to afford one of those expensive custom revolvers, back then, being involved in more mundane things like raising Kids, making house & car payments, buying groceries, clothing, etc. Now almost 60 later, I'd still like to have a revolver of that type, and, still can't afford it. Some things just never change.
Chubbo