Where can you find info on a Chicago arms model A 12 gauge shot gun?

I have been serching for information about Chicago arms model "a" 12ga pump, or the company and there is not to much information out there on the subjects. my weapon has a star before and after *Chicago arms * and is Excelent working condition I still use it for hunting. I found one other person than you that as such a weapon and he is in Canada. Although you may be that person I don't know. But if you find out anything I would like to know so I can follow through with my research. Thank you.