What are Janssen and Sons shotguns?

Janssen was a Belgian gunmaker. According to my notes, the company used this name c. 1892 - 1896. Answer I have a Janssen Sons shotgun that used to belong to my grandfather. It has carving on the side of the breech and the bottom. It also has carvings on the walnut stock.

I was given this same gun from my father. It has very detailed carvings in the stock and etchings on the barrel. I have been unable to find out anything about the maker or a present day price. I have looked in many of the shotgun books. My father paid 50 cents for this gun during the depression.