With the brief description that you have supplied,I would say that you have a Smith and Wesson model of 1905 4th change revolver.
50-275 or so
You need the services of a gunsmith.
brand new it would be worth 750$.
The value of a Smith and Wesson 1897 serial 539443 pearl handle nickel plated gun depends on its condition. This gun in excellent condition is valued between 1200.00 and 1400.00 as of 2014.
Use a magnet. If the gun is nickel plated, a magnet will stick to it.
200 or so
34 yrs old
You would need to include the overall condition of your revolver,the amount of original finish remaining,bore condition and serial number(to date and identify the correct model of revolver).Only then could a value be placed on the firearm in question.
50-550 USD or so
sounds like the break open series. they were made from late 1800's to early 1900's with little records keeping.