Yeah, Pizza Bob is correct about the fit onto a previously drilled 80's gun. I made an assumption that S&W drilled the newer revolvers somewhat to match what Bo-Mar ribs but that may not be correct...... As noted, the sights were manufactured for the fixed sight revolvers as the model 10's. This allowed the m-10 to have a target sight.
As to value, I am not certain. Original Bo-Mar sights are very well made and a lot of knowledgeable gun folks will try to acquire them for custom work. It seems like I have seen some of the full ribbed sighted equipment (rear and front sight on the rib) go for c. $100+. In this case I would expect the sight is worth at least $50 to $75and perhaps more depending on availability of the same part for sale on other forums or part houses....
My understanding is that Bo-Mar is no longer in business, so, parts like this can be worth some money to someone looking for a piece like this. Now, don't hold me to this but, if I remember, this particular sight was originally meant for the heavy barrel model 10. It was constructed to fit over the back strap of the frame built for the heavy barrel and the front sight would not need to be altered..... one of the main advantages to buying this sight... Bo-Mar ran ads in all of the major gun rags of the day....Guns and Ammo, Guns, Shooting Times, American Rifleman and other that don't come to mind.... (Bo-Mar---Bob and Mary) I can't right now remember their last name.
