The Vehicle Identification Number (VIN) plate was attached to the vehicle during final assembly and contained the Division, Model, Series, Year, Assembly Plant, and a 6-digit sequential serial number beginning with number 100001 for each plant that assembled the 1967 Chevelle.
VIN plates are required by law but have been known to be swapped to prove a Super Sport SS396 car. Always look for the VIN plate if you are in doubt. If the VIN plate has been changed, that is a violation of the law and you should stay away from that car.
Pay special attention to the special rivets used to attach the VIN plate. Unless you are an authorized body shop facility, even the ownership of these rivets is illegal in most states. Most 1967 Chevelle VIN plates use a 6-pointed star shaped rivet although it has been reported that some early 1967 Baltimore Chevelles used the 1966 Chevelle style of round rivet. I have two VIN plates from September of 1966 for Baltimore and these have the 'normal' star shaped rivets so I cannot confirm the round rivet reports.
Also found on the VIN plate is the wording "CHEVROLET DD" where
the "DD" was meant to be used for Delivery Date when the vehicle
was sold at the dealer. It's rare to find any additional stamping
on the VIN as dealer's tended to not do this. The two examples below
do exhibit these markings. Due to the differences, it's not certain
whether there was a standard meaning to the stamping or if it was
up to each dealer to stamp whatever information they deemed necessary
for a delivery date.
The delivery date of "1 67" is clearly visible in this photo indicating the car was delivered in January of 1967. Dealers were not always consistent when they stamped the delivery dates. This car is a mid December, 1966 production (second week according to the body plate) so the "1 67" could be for January, 1967. Note the difference in the dating with the example below.
This stamping is not so obvious. The 103 could indicate January 3 since this is a first week of January-built Chevelle. The Fisher Body plate on this car indicates 01A body build date meaning the car was assembled at Kansas City sometime between January 1 and January 7. It is possible the car could have been delivered to the new owner on January 3.
Until further information comes to light about the procedure and what was supposed to be stamped on the VIN plate and with so few examples, the meaning described is speculation.
On the pages in the links for VIN plate examples by plant, there is a table showing the approximate last VIN for that plant for each month, however August of 1966 is listed as "unk." It is known that at least the Kansas City plant did assemble the 1967 model year beginning in late August of 1966 as there is a Fisher Body Number plate indicating the 4th week of August, 1966. Whether all plants began this early or not is not known.
When a vehicle has to have a new VIN assigned by a state for
whatever reason such as recovered theft, rebuilt from salvage, etc.
that state will issue a plate/sticker and number. Here's an
example from the state of Pennsylvania.
Note that not all assembly plants used the same formats on
their VIN plates. Compare this Framingham example to the Kansas
City example above; there are spaces on either side of the plant
identifier letter "G" where the Kansas City plate does not have
LIkewise, a Fremont VIN plate is another example of a
difference between the assembly plants. Note the "13817" is not only larger than the other
characters but the number "8" is a different font.