The best I was able to determine, the company got going then the stupid gun control of 1968 killed off their product line, could no longer import these guns. It is very possibly a pot metal gun. It is very possibly a piece of junk (Unclear, but several folks did not care for them!).
Charter is a red herring: they stamped the word liberty on a gun and their company is charter ARMS so it tripped the search engine.
That is all I could find today on the webs.