That is a beautiful pocket/overcoat size pistol. And in great condition. Note the lack of a belt hook. The Spanish seemed to be almost obsessed with using belt hooks on their pistols. Both military and civilian. Most of the pistols that lack the belt hook seem to be of this small pocket size. Which makes sense since their size for concealment would make the hook unnecessary.
Also, interesting that it is unmarked. Somewhat unusual for Spanish guns. Possibly the original owner requested this so that the gun could not be traced back to the original gunsmith in case the pistol ever fell in the wrong hands ? LOL
Again, very nice pistol.