First off, since nobody has said it, welcome to the forum.
That should be a Model 10-6 (look inside the frame recess exposed when you open the cylinder, it should be so marked there) that dates to about 1969.
These are excellent shooters, but as far as S&W's go, pretty common and pedestrian as opposed to rare and collectible. In used condition sans box, a few hundred dollars retail is about right. The value takes a bit of a hit if the stocks (grips) aren't numbered to the gun (stamped inside right panel).