Copy and pasted from Gunbroker.com.
As you already know, it is a Belgian made scattergun. Most of them are worth between $100 - $200 (and yours is no exception to that).
There is very little collector interest in any of those old Belgian made clunkers, and as a result, there is precious little that has ever been written about them. There were several million of them imported to the U.S. between 1890 - 1913, and they sold for $6 to $9 new.
None of them are safe to shoot with modern ammo, and many of them are only mariginally safe with the original blackpowder shells for which they were designed. If the gun locks up tight, and the bores are in excellent condition, they can be shot with 2-1/2-inch or 2-5/8-inch blackpowder (or equivalent) shells. You can not use current standard length shells in them regardless of the type load. I would highly recommend having the gun inspected first (bore scope it as a minimum).
I think it would look great over a fireplace hung on the mantle.