What page in the “Book” is it on?
Page 196 of the 3rd edition of the Standard Catalog of Smith and Wesson.
I guess it was just (5) made with a satin nickel finish, after the run of (25) for the FHP.
I'd also like to correct that I had previously stated a .375" hammer width...it is .400".
At one point a few years ago I was really into old S&W revolvers. I managed to acquire about one of every common model until I finally lost interest.
Unfortunately my knowledge has diminished to where I'm just dangerous now. At least I know where to go to find the correct info though .