There is a scenario that would tie all the facts together.
9189 might have been an unsold 1979 GTS that the factory updated with GT5 coachwork sometime after the 1980 showing of the first GT5 in Turin. 9189 is 61 cars away from 9250, a bit more than a year's production at deTomaso at that time.
Perhaps Roland can solve the mystery when he checks the factory records.
your friend on the PIBB, George
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