The value could be as low as $50, or as high as several hundred, depending on condition and the exact model. S&W has been making handguns for a long time, and there are a hundred different double action revolvers out there. You best route would be to have a gun shop examine what you have.
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
29,900 in good shape
What model?
100-10000 USD depending on EXACTLY what you have.
50-275 or so
50-500 usd
Engraved and nickel plated Smith Wesson Model 29
Impossible to answer without a detailed description of all markings and features.
50-500 usd
You need the services of a gunsmith.
No such revolver made by S&W