James, WELCOME ABOARD! We are glad to have you.
What a beautiful car!
To try and "guess" the history of the car, there are 3 numbers that come in handy, the serial number (VIN number) that is on the footbox in the front trunk (also affixed to the dash board), the body service number that is also on the footbox in the front trunk, and the build date affixed on the drivers door jamb.
The VIN number tells us the sequencial build order and the build date of the coach only. The coaches were assembled by one of 3 coach builders (Carozzeria), trucked to the DeTomaso factory, and stored on a lot outside the factory until they were taken into the assembly area at the factory in Modena for final assembly (fitted with drive train, suspension, steering & brakes). The coaches were not necessarily taken to the factory in the same order they were assembled at the Carrozeria. Quite often it was just which one was nearest the front door, if you get my drift. The body service number gives us the actual final assembly order of the vehicle, and the tag on the door the actual month & year of the final assembly of the vehicle.
None of the tags on the vehicle indicates what year the vehicle was sold to its first owner, or what nation was the car's final destination.
your friend on the DTBB