Well I am talking re-stamps, and specifically 1st gen Camaro specialists. (I know Steve has more knowledge than just Camaros)
The firewall tags (&rivets), the motors, the trans stamps, alternators, distributors, component dating. Hardware and suppliers marks that were used on the assembly line. The many changes during the different model years, from deck lids, to exhaust.
I agree with Gary no one guy knows it all, but I wonder how many guys are in that 1% of knowing most?