Hard to tell from the small pics....
But here is some info:
Since these were all aircraft style belts, the 'legit' ones carry the Mil-spec designation for these style seat belts, MS22003-1 for a 3" belt
Since safety items needed annual certification, I would guess that the FC number is the year of manufacture...having seen orig Cobra belts with an FC65 designation.
This came up a few years back on this thread:
http://www.clubcobra.com/showthread.php?t=57232