Trunk lip vin number

I have a 67 barracuda fastback that I have owned for several years. Today I just happened to look at the usual vin number stamping under the trunk weatherstrip and that number does not match the number on the vin plate.

It looks to be stamped wrong from the factory. The vin tag does not look to have ever been off of the car. It has the correct rivets still holding it on the door pillar.

The trunk stamping has 10 digits, all numbers. I thought the stamping only should have 8 digits.

The car is a 67 formula s 383 fastback that is an automatic. It still has the fender tag on it. The car needs restoring, but the original 383 and torqueflight are long gone. The car had buckets, disc brakes, vacuum gauge, 3.23 posi, and it was a special order car (U1) code. It still has the correct k member with the sway bar. Any ideas.