I'm kinda hoping you want the estimate for insurance and perhaps as much info as you can get. That's your business. But, to get maybe $650 for Grandpa's gun, that would be a hard pill to swallow for me. Was he a policeman or other armed type job? Either way, just my opinion, you may want to check for the gun's history. Probably just his revolver, a very reliable one to have for whatever reason? We need no reasons to own firearms; just something that we like! Maybe if you have a good gun shop in your area you can get a better guestimation. Also, what Peak53 said. It's addicting, and good, clean fun. Welcome to the Forum, by the way. Take a 6-pack of Soda Pops out into the sands and empty a can, shoot it, and repeat! Always curious to look inside the right wood handle to see if the same serial number is stamped on it. Just another piece of info for your own knowledge. Peace! Jeff T., Pittsburgh, PA, USA
Also, if it has the original box & accessories with it that adds value.
In the end, it's your business what you do with it, but at least run a few boxes of ammo through it!