65, 66 Formula S

I got a 65 "S", rad support numbers show an April 1st build date, the first one...#00001 no foolin!
Shown here in 3rd motor '340' trim. Lost 273/4 to bad rod bearing and then lost 318 to oil pump...




I don't understand how the first 65 S was built in April. They were announced and came out with the new models in Sept. 1964. My 65 S was built in December 1964. Do you by some chance have an early build 64 Barracuda?