Of course, after days and days without a positive identification, obviously another posibility was that the “mistery plane” was not a real plane after all. Me and my friends also in Spain still was unable to identify the plane. I searched also all know models of metal aviation toys, made in Spain at the forties, from “Paya” and “Rico” firms, also without results. The plane maybe is a 1:1 mockup of an unbuild model, a failed project, a decoy, a model kit or a toy… who knows… I still search… 🙂

Maybe some type of Curtiss model 75 demonstrator with fixed undercarriage?
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Two new views published in Spain from the owner. The black circle on the engine cowling maybe the exhaust?. Under wing EC8 or FC8. The four “fuselaje inscription” maybe a 2 or 4 number?, and finally note more planes at the right on the photo.

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Thank you so much to all for those informative posts. The plane is still unidentified. On the positive side, i know the spanish who adquired the photo. Maybe in days i have better resolution scan of the photo. For me the plane has some resemblance with the Northrop A82. Note same model and position of the pitot tube in the photo. Maybe the unidentified plane is some variant of this plane. Who knows 🙂 Cheers from Spain.
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Thanks for all replies. The photo is currently for sale on this spanish site. The seller has a group of photos of aircrafts of the spanish air force capted in 08-1941 at San Javier AB as stated almost in one reverse. Really very rare plane, i still search info… https://www.todocoleccion.net/militaria-fotografia/foto-formato-postal-avion-militar-espanol-guerra-civil-o-postguerra~x99699239