I believe that gun is by the Spanish company Jukar which makes (made?) inexpensive guns like that which were imported in the 1960's/70's. I also think Eibar is the Spanish proof house, not a manufacturer.

Be sure to check to see if there is a load in the bore by inserting the ram rod and comparing the distance it goes down the bore to the length of the barrel. The bore should be clear to within about 3/4" or the nipple.