Its a baby russian but I never saw wooden grips on one before. So I googled it and found someone who posted a video of one exactly like it with those same style grips:

YouTube - 1877 SMITH & WESSON BABY RUSSIAN REVOLVER

I'm sure someone here will know more about it. Baby Russians aren't all that common. Nice gun.

I just noticed that the guy in the video said the subject gun was worth $250-$300. That estimate is way low on a gun in that kind of condition I think. Someone should try to contact the guy and make an offer