The proof marks are Spanish (Eibar) used from 1923 to 1929, so the revolver is of Spanish manufacture.
While "ALFA" was the trade name of the Adolf Frank company, that trade mark is not one they used. I think it is one of many names used by various Spanish makers on a wide assortment of both pistols and revolvers in the between-wars period.
With few exceptions, most of the revolvers imported into the U.S. in that era were, to be blunt, junk, made from cheap "pot metal" (cast iron of the type used for making cook pots). I have seen several blown up with standard loads, and STRONGLY suggest you not only not fire the gun but disable it so it can't be fired, or turn it into a "buyback" program. It would serve them right, and it has no collector value or interest.
It MIGHT stand up to standard .38 Special loads, but whatever you do, don't try to fire it with high pressure (+P or +P+) loads; you will be risking injury.
Incidentally, while those revolvers were outwardly copies of the S&W M&P, the lockwork was of the Webley-Colt type, with a dual leaf spring powering the hammer and the rebound lever.)
Jim