I don't know if you are still around here. I know something about them. They were from about '62 to '68? Whenever they enacted some kind of elcheapo gun ban. Much of it is German made. RG maybe? Assembled here in the USA to get around legislation of some sort. The frame is pot metal. Characteristic for it I experienced was it won't always fire in DA. I read it somewhere on the net too. Yours is one of the later runs.
"The Regent" Washington DC How ironic! American Regent "The Regent" 22lr revolver teardown, repair, assemble, test - YouTube
These were genuine "Saturday Night Specials." They sold for $12-$18 new.
Not too long ago I saw a man defended his home and shot a burglar with it. It was in Hampton VA. The man bought it and never fired it until he needed it!
Arminius may be the German company that made these.