I happened accross the same firearm, hawes firearms co. Cal .25 Semi-Auto.
It came from my girlfriends father who served time in WWII. We believe he got it from Military. Unfortunately he has alzheimers and we found it on him loaded one day. We took it, hid it at my house, and put one of those gun locks on it. We dont want to ask him about because he may want it back.
Im a mild gun enthiast and prefer rifles. No idea where to look to find out about it.