Argemtine M1911s - Literature?

[srtolly1]

I'm a little late getting in on this but I have a Ballester Molina and am trying to figure out if it was a police issue or not. The only marking I can find aside from the Argentine crest is a letter F inside an oval on the right side of the slide between serations. The guy I got it from thought it was police issue. It was in rough shape when I got it and missing th lanyard loop on the butt. I cleaned it up and hit it with some cold blue to protect it. Great shooter. Any help is appreciated.