VIN sequence number

Sequence #'s are plant wide. Most Duster 340's were made at Hamtramck. Alaskan T/A (a member here) can tell you more..maybe he will chime in
I also have 4xx,*** 1970 Duster 340 with a SCHEDULED build date of 7-15-70.

My 70 Duster has 7/30/70 build date.