You are correct the F designates that it is a GFI breaker. QP is the breaker design. That design was standardized and used by many different manufacturers since at least the early 70's. That breaker will fit Square D Homeline series, some Cutler Hammer, Siemens ITE, Challenger, GE, Sylvania, Westinghouse, and Bryant panels. There might be more that I can't remember.