68 Barracuda Formula S 340 missing trim tag and Vin / dash

I realize that, what I'm saying is the body stamping is damn close to a vin.
What does the first letter(in this case "B") designate in the body stamping?
Lol, the vin on the title was grabbed from the SO stamping to generate a title and someone MAY have added the P. Guess we'll never know unless the original owner can fill in the history blanks.