Re: help me identify this pistol
I will extend that warning; I strongly recommend against firing that revolver with any ammunition of any kind. Spanish revolvers of that type were imported into the US by the ton in the 1920's and 1930's. While some were reasonably well made, many were made of cheap cast iron of the type used to make cookpots (hence, "pot metal"). Many have blown up in firing normal ammunition. At least the makers of that one thought enough of the product to at least put their initials (but not their name) on it; most have no maker's name at all.
IMHO, the gun is worth what you paid for it; I suggest you retire it to wall hanger status.