Nice shotgun. If I had to guess at a model I would say a model 550 "Field". If you can provide clear pictures of the barrel flats and the bottom of the barrels just in front of the barrel flats we could likely tell you the year it was proofed at the Eibar proof house. Value is whatever it brings when sold and depends on how long you are willing to wait for a buyer. If I were selling it I'd price it at $800 - $900 to sell in a month, $1900 to sell within a year, and offer it at $3000 if was willing to wait for a deep pocket and willing buyer.
