I know I have a couple of these (maybe 3) around yet. I am not sure if both are .32's or one may be a .38. They are a nice little gun and have a simple mechanism. I much prefer them over the DA model. Mine are nickel plate as I think most were.
Howdy Again
The 38 Single Action Top Breaks with the spur triggers were a little bit larger than the 32 Single Action Top Breaks with the spur triggers.
This photo should explain pretty much everything about the comparative sizes of various antique Smith and Wesson Revolvers.
Starting from the left, top to bottom is a #2 Old Army, #1 1/2 1st Model, #1 1st Issue. These are the three sizes of Tip Up S&W revolvers. To load them the barrel was rotated up, and the cylinder removed for unloading and loading. The top two were chambered for 32 Rimfire, the little #1 was chambered for what we would call today 22 Short. The middle column shows the three sizes of single action Top Breaks. At the top is the #3 Schofield model, in the middle is the (#2 )38 Single Action (Baby Russian), and at the bottom is a (#1 1/2) 32 Single Action 1st Model. Chamberings are, top to bottom, 45 Schofield, 38 S&W, 32 S&W. At the right are some double action Top Breaks. At the top a #3 Double Action 44, in the middle a (#2) 38 Double Action, at the bottom a (#1 1/2) 32 Double Action. Chamberings for this group are 44 Russian, 38 S&W, 32 S&W. Notice there were no #3 sized Tip Ups, S&W experimented with a 44 caliber Tip Up but the mechanism was not robust enough for a 44 caliber cartridge. Notice too there are no #1 sized Top Breaks. Only #3, #2, and#1 1/2.
Notice the comparatively different sized cylinders, which account for the different sized frames.
Regarding blued vs nickel plated, yes S&W finished more of the small Top Breaks with nickel plate rather than blue. I have no figures on the large (#3) Top Breaks, but I have seen more with a blued finish than with a nickel plated finish.