There are three S&W models that could fit that description, the Single Action Model No. 2, First Model (S&W terminology of the period is VERY confusing), aka the "Baby Russian", the Single Action Model No. 2, Second Model, and the Single Action, Model No. 2, Third Model with a spur trigger (they normally had a trigger guard), aka the "Mexican model".
While any of the three could bring good prices if in perfect or near perfect condition, your description makes it unlikely that it would bring top dollar. Good pictures would help in an evaluation, though.
Jim