Rigarmi pistols were sold by FIE of Miami at least for a while . They put their own model designations to them. 'Guardian' was one of the 25 autos but I don't know if this one was it.

Another of the Italian made under $60 (at the time) pocket guns was the Galesi.
About the same thing, looks almost the same too but made by a different company. There were many of these small shops making stuff like this for export sale mostly to the US but the GCA68 ended all that.

You have to actually shoot them to be sure of how they function. Just manual functioning doesn't tell the story. Some suffer from weak springs. Some are really just poor quality, others not bad at all.
Lot's of similar guns from Belgium too but the W German, Spanish and Italian imports prevailed just after WW2.

Most are nothing really new, just a copy of something else out there or a combination of them. Only so much you can do anyway and still have it work. Some try and get too small and there's a point where the size doesn't allow for motion and springs to work well enough for complete reliability.

Just sold a preWW2 Belgian 'Melior' .25. It has an interesting TD if nothing else using the rear sight & an internal breech block assembly. It was very reliable.