I have to agree.
Very few old shotguns are worth much unless they are of the elite brands familar to shotgunners.
One important thing to know is that damascus barrels are very dangerous. They are NOT designed to handle the pressures of modern shotgun loads and will come apart. I'll bet you know that already, however. Damascas barrels were created by wrapping thin wire round and 'round to create the barrel. If one of those wires fails, so does the shotgun and at best, it's junk. At worse, you'll lose a hand or better.
What I'd do is do a Google search using the brand name. Maybe you'll come across a link that will tell you more about them.
About two years ago, I had a custom made Antonio Zoli sxs in 16 gauge. It took a good two years for me to find anything out about it but I was finally able to confirm that it was never imported to this country for sale. ( I ended up emailing a collector/shooter in Italy! ) When I got it it was brand new condition, too, never shot. Even so, with the rarity and condition, the best I did was about $500 to a collector who wanted Italian shotguns. I was lucky at that. It did get me a very nice 20 gauge o/u that I lusted after. So, do some research on Google and polk around at some of the shotgun websites that cater to the antique market and maybe you'll get lucky.
My opinion, however, is that it will be a nice mantel piece with a nice plaque underneath it describing what it is and who owned it and when. It'll have a lot more to say to you and your family that way.
Rome