I would not discount them... I have a few late F's (by late I mean mid to late 50, or late pre-mils, I really don't ever talk about post-mils) that don't match great but share inspectors marks and/or the forearm has the serial in chalk on the back. I think the quality ball just got dropped in this time frame. If the general fit and finish looks okay, and the seller allows, I would check the inspectors marks and see if they match.
