Before Word War I and during the years between the two World Wars a big gun industrie was existing in Spain in the surroundingsof the cities of Eibar, Ermua and Elgoibar, which flooded the market with a vast amout of cheap vestpocket pistols. These pistols today are commonly designed as "Eibar"-pistols and are all following the same pattern.
The problem in linking them with certainty to particular gunmakers is, that there were just a few big manufacturers (known by name) and lots of small and smallest gunsmithes down to one-man workshops, which were producing on demand of bigger companies. The problem is getting even worse by the fact, that there were lots of trading companies existing too, which got their pistols from different makers and stamped them with their trade names. By that pistols with same name may come from different makers as well as pistols with different trade names may have the same origin.
The only help in linking them to a certain maker, if the company-name is not stamped on the pistols (which is done just in a few cases), is to find letter combinations stamped somewhere on the frame (mostly at the right rear side, sometimes below the grips or not even at all...), which were shortcuts of the different gunmakers.
The pistols in that department were up to now not possible to be linked to a certain gunmaker. However, because of the proofmarks, Spain origin seems likely .
ANY FURTHER INFORMATION WILL BE WELCOME!