GTS question

This is just a question, I have no intention on buying a GTS. I would just like to have a better understanding on how to determine a true GT car. I was told that all GT, GTS etc had "GT" in the serial number and that it was by the serial number that you could determine if it was a factory GT car. Yet I see things like this on e-bay http://cgi.ebay.com/ebaymotors...&hash=item3a62168f5c
Where a car is listed as a GT but the serial number does not reflect the "GT" designation.
Can someone explain please.
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