Jeff, You are talking about the
Freemont Broadcast Sheet which were of the new style in 69, while the
Leeds Broadcast Copy were the old style in 69.
I think the new style were stamped with a timeclock style machine. Which means the Freemont Chevelles may have received the VIN on the GM side not at Fisher Body.
The Camaros and the Novas still used the old style in 69 as did the Novas in 70. Greg