Actually, and if such details really interest you, you very likely will want to get them from the horse's mouth----------so to speak; because the previously identified source treats with them only superficially. The horse's mouth, on the other hand may very well tell you more than you really wanted to know.
The previously identified source is going to give you broad brush on pretty much every S&W model ever made.
The horse's mouth is going to tell you about Smith & Wesson 1857-1945 (coincidentally the name of the book)---also known as "Neal & Jinks" (or N&J)----the authors. It's going to tell you EXACTLY what you asked about---rather precisely---and rather thoroughly. And anybody here who might actually answer your questions here is going to copy the material straight from the book----they'd pretty much have to--------at least I would.
So------you pays your money and you takes your pick. (Actually, the well informed among us have both books----just as openers. They go on from there with other books and voluminous notes gathered from years of poking and prodding to become the VERY well informed. Those folks could write some more books---------wouldn't even break a sweat.)
Ralph Tremaine