I can tell you that most of the Spanish shotguns are hard to track down.
The vast majority of them were produced in EIBAR SPAIN, kind of the DETROIT of Spanish guns if you will.
I have two doubles posted in this section that I have been trying to trace for years.
One is a GOROSABLE and the other is a RENO.
Most of the Spanish guns were pretty nice guns, but a few were junkers.
Sorry no real help!
Good luck!!!
LONGTOM