That is pretty much what I think also right now.From a reddit post showing the same damn gun.. "Automatic Pistol Co. Cal 6.35"
It'll be a spanish clone of a colt vest pocket, but without a grip safety. There were a lot of small shops in Spain that made somewhat rough copies of colts and brownings during and after WW1.
The pattern on the grips could help ID it more specifically. Many used the same design specs, but often had unique proof marks or grips if the factory itself wasn't explicitly named on the gun.
In any case, it won't be a straight across dimension for dimension clone of more popular guns. Just the core mechanical concepts and the looks.
So, probably pre-WW2 made for the commercial market. It'll shoot .25 ACP.
Also in the post says; Ruby type of copy of the Colt 25 pistols