I inherited from a friend what appears by serial #, to be a 1906 12 gauge. It is in very nice condition, doesn't look to have been refinished at all. I am not sure if I want to keep it or not. I do like that is is so old - to me -, but my ? is how can I really know what it is worth if I decide to sell it? And more importantly how can one tell if it has been "worked" on or not? Thanks!