My dad has given me a Universal Double Wing 2016 12 Gauge 28" shotgun, made in Spain, manufactured in 12/76 and has a serial number in the 49000. I have been looking all over the web and cannot find anything on it. I have people telling me that it is worth a lot, but the maker of the shotgun has since been out of business (1984). I am just curious on what it is worth. Thanks to all for info.