Re: S&W top break
.38 Safety Fourth Model. Some 104,000 were made from 1898-1907, serial range 116003 to about 220000. The Safety models were also called the "New Departure" (by S&W) and "lemon squeezers" (by about everybody else).
With so many of that model made, value is generally low, but I would put that jewel at easily $600, maybe $800+ due to the long barrel and the grips, which I have little doubt are genuine mother-of-pearl.