WM23M9A309967 body sequence # 311719
IMO these 4 (at a minimum) A12 Super Bee's bodies were assembled 1 day after the above Super Bee. (maybe originated in assembly would be more appropriate) NOTHING tells us when they were completed.
WM23M9A307000 body sequence # 312487
WM23M9A307001 body sequence # 312519
WM23M9A307005 body sequence # 312583
WM23M9A303037 body sequence # 312637
..... if these cars are wearing fender tags with authentic information.

Lynch Rd. 1969 assembled ~1,000 cars per day