1st Gen Barracuda ?

The Valiant emblem was on the tail panel below the deck lid and was only on the 64 model because in 64, the Barracuda was actually a Valiant with a "Barracuda package" The Barracuda became it's own model in 65.

There are a lot of 64's around that don't have the emblem because most people thought they were not suppose to be there and removed them, this is why that emblem is so uncommon to find on a Barracuda.