As Patriot has said, you may get better results posting your enquiry on the Spanish Gun forum.
FWIW, the Victor Aramberri guns that I have inspected were primarily utility to medium grade guns. During the 1970's, the firm
built SxS and O/U guns for the Pedersen Division of O.F. Mossberg Company in North Haven, CT., USA. The Model 1500 O/U featured a Boss/Perazzi type action and deserved greater recognition than it received. Aramberri also built the the Pederson Model 2500 which was a good but, nonetheless utility grade SxS for the American market. I suspect that Aramberri, like many other Basque gunmakers, built both price point guns and high quality guns depending upon the requirements of various distributors.
Aramberri also built and private labelled a SxS with vent rib and either double triggers or a single non-selective trigger for the American market which was marketed under the Star Gauge name by Interarms of Alexandria, Virginia, USA. during the 1970's.
It is my understanding that the Victor Aramberri firm was merged into the ill fated DiArm organization during the mid 1980's and died with it a few years later. If the Asociacion Armera were to search the records of DiArm, they may find information regarding the Victor Aramberri firm.