My neighbor is offering to sell me this like new Model 10-6. It has the original box and paperwork. It looks like it's been fired but still in pristine condition, not a scratch on it. The ser# is 2D42742. Does anyone have one of those S&W books to look up the manufacturing date? He said he'd give me a fair price. He said "look it up on the Internet and see what it's worth". So what do you say, what's it worth, and what's a fair price?