I DO have both a 4" and 6" 657 in the box, and a 4" S prefix M-57 and M-58.
But I have to say my FAVORITE forty one mag is my 6" Light Weight Hunter in .41 magnum. PC 170062. I think they called it the Magnum Hunter, RSR Special. 6" ported barrel,Weaver scope base, ball detent lock up, VERY accurate. The .41 is on top, my 625 is on the bottom.
They also did them in the 629, 625 and possibly even a model in .357 magnum. The .41's were built 1995-1999 IIRC.