1968 Barracuda fender script

Finishing up the restoration of my 68 Barracuda. Apparently there are 2 different types of fender script for a 68. My car was built on october 15, if that helps. One kind is all chrome and another has black out. Does anyone know what the reason for the two different scripts is, and which one is correct for my car. Also, it is a formula S if that has anything to do with it. thanks,
Lou

What Kind of evidence are you finding that show there were two different emblems?

And by blackout you mean black outline of the letter and just a chrome on the very face of the letters??