What’s the exact process to identify a real 66 Formula S Barracuda?

In 1984 a teller at the bank at the Oxford Valley Mall in Langhorne, PA had a ’67 convertible, white, white top and red interior, 273 4 Barrel, 4 speed, 8 ¾ diff, buckets seats and the single exhaust chrome tip. Nowhere on the car did it say Formula S! Does anybody have this car? Does anybody know about this car? I was out of touch for a week around the time the young lady was getting married and moving to Holland, yeah that Holland, in Europe, she couldn't take it so I missed the car. I don’t know if it was early or late production, did the dealer order something like a Formula S delete or did a customer walk in and order all the Formula S stuff by the piece? And then there was my friend’s ’68 383 4 speed Notchback non-S. It had so much rust it probably was considered a lightweight!