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My comment above( White convertible ) stays as my triva answer on the first one build in Production!
BUT there was a blue convertible sold two days before the original launch - was not supposed to be available !
not the first one produced, but the first one sold
Gail Wise, 71, of Illinois, poses with her husband Tim in front of her 1965 Ford Mustang. was the first person to buy the retail Ford Mustang, 2 days before it was supposed to be sold, on April 15, 1964. Wise was recognized by Ford Motor Co. Chief Operating Officer Mark Fields before the unveiling of the all-new 2015 Ford Mustang,