No such model number. A model 1891 single shot handgun, however, could range from 100-2000 USD depending on specifics.
Try e-gunparts.com
@ 4"
I would start my search at Smith and Wesson first.
Yes.
4.5 or 6 inches
You will need to ask a gunsmith
22LR
Model 37
Look on frame inside the cylinder area to find the model number of a Smith and Wesson 357 mag snub 2 in stainless barrel
Your smith and Wesson model 686 is valued at 250-425 dollars depending on condition.
What is the value of a model 24 Smith & Wesson revolver with a 4" barel? It has never been fired.
19.5 oz. with 1.875" barrel, 21.4 oz. with 3" barrel