Friend emailed me couple photos of the above 12ga O/U imported by American Arms Inc, Overland Park, Kansas. It is marked as their Excelsior model and is from Elgo Eibar Spain. The gun is essentially new and inherited from old stock in his brother's gunshop. There are two issues I need help with.
First, the top lever won't move so the barrels are not off to get photos of the proofs. The style of the receiver is much like a Merkel with the reinforced shoulders and a top bolt similar to a Greener but almost rectangular in shape. That top bolt is protruding about .03" so I had him place a little penetrating oil on it's seams in hopes that might loosen the action enough to allow the top lever to rotate. The gun has not been used at all and probably dates from 1986 when these were being imported, so it may just be extremely dry in addition to being finished very stiff/tight from the factory.
Second issue is approximate value.
I will try to get some better photos attached shortly.