Build date factory stamped on 1967 vin plate

[67conv6cyl]

Why do a few cars have this factory stamped on vin plate?

[KurtS]

That spot is for the delivery date. They knew this car was for internal usage, so the plant stamped the month/year delivery date on the tag.
I think I've seen a bulleting that mentions this.

[67conv6cyl]

What type of internal usage?

[KurtS]

Internal usage = used by GM, not sold to a dealer.

Thanks to Warren L for the attached letter!