For 1966, Thunderbird faced increasing competition, pressuring Ford to take the T-Bird line more up-market. Exterior styling was modified taking cues from the popular Mustang, though 1966 marked the final year of the “square bird” with the novel sequential turn signals and the last time a convertible would be offered until 2002. This is one of just 5,049 convertibles produced for 1966 of a total Thunderbird production of 69,176 units. Equipped with the 390-cid V-8 and Cruise-O-Matic automatic transmission, this Emberglo over beige leather example is equipped with power steering, brakes, antenna and convertible roof along with air conditioning, an AM radio and a sports roadster tonneau.