Stainless wasn't an option during the time - nor was chrome-plating.
Guns of the era were blued - blued and case-hardened or nickel-plated - and if South of the Border, sometimes silver-plated, but that was more of an electrolytic 'wash'.
Stainless would come about in the 1960's when S&W built the first of their Model 60's.
The big thing with re-plating is the metal preparation needed in order to make it look right, and by this time, many of those old guns have significan wear on them, enough that markings will be irretrievably lost if polished.
Instead - try Happich's 'Simichrome' and 4-0 Steel Wool - finish with a soft cloth.
It'll polish and clean up a dull finish and make the weapon look 'carried, yet well-maintained'.
That's better than 're-plated'...
Good Luck!
Vaya,
Scouts Out!