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I thought hamtramck had 2 lines...the second one starting with sequence# 200000.

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I think you are mixing a couple of things...

As Barry said, Hamtramck had two lines and in some years, what line the car came off of is indicated on the tag.

Some early cars like Valiants, Lancers, Barracudas and Darts had VINs that start with the 500000 series. These cars may have been built at the Hamtramck plant and come off of the same line such as line 2 so it would appear that cars built on line 2 all start with 500000 but the connection is a little loose. The VIN assignment is related to the make of the car, not the production line from which it came.