I'm not sure why? It was built in LA and they did some weird stuff to there tags but I've never heard of this before.
IMO it's no major, don't mean to sound rude but the car is not a #'s vehicle so having something that can't be explained is neither here-nore-there.
Looks like a great car though, pitty your selling.....may I ask why?
vMaybe you have another Mopar linned up?!?!?
Anyhow good luck with selling and I hope I helped a little.