@raserrano I would agree metals are a safer long term investment. The PF prefix bar's you have pictured below have an estimated mintage of <800,000. This style 1oz bar has many different serial number prefixes. Including P, PA, PE, and PG. There has been no information explaining what these prefixes stand for. Atleast to my knowledge anyways. Thanks for sharing your photo.
RE: GIVEAWAY!!- Engelhard 1oz Silver Bar