sounds like the break open series. they were made from late 1800's to early 1900's with little records keeping.
With the brief description that you have supplied,I would say that you have a SMith and Wesson model of 1905 4th change revolver.
50-1000 usd
What model?
50-500 usd
50-275 or so
100-10000 USD depending on EXACTLY what you have.
Impossible to answer without a detailed description of all markings and features.
Engraved and nickel plated Smith Wesson Model 29
50-500 usd
No such revolver made by S&W
You need the services of a gunsmith.
Less than 100 to over 1000 depending on specifics.