anyone ever hear of this gun maker?

[300ultramag]

i just came across my fathers old side by side 20 gauge. it was my grandfathers shotgun (i think) till he gave it to my dad.

there are very few markings on the gun besides some tool work-
i thjink the companys name is ---Firearms International Corp---
Wasington DC or atleast thats whats stamped om to the one barrel ---the other barrel has ---the first word i cant make out but it goes something like this

_______ y granzabol made in spain

then on the side it says "matador"

cant find any info via the net . any info on the maker or model will help thanks ---can also send a few pics if needed