1967 Barracuda Formula S 383, what is the earliest date code?

Alaskan_TA said

Available from the start of the 1967 model year in 1966 - https://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1967/CCI05152011_00015 (983x1280).jpg

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Yes I know, but I want a real world date as to when the first one's hit the dealerships.