Similar situation in Ohio. Once you have a "Historic Vehicle" registration and plate, you can have a plate on your vehicle from the year of manufacture of the vehicle. You have to apply for that, however, and get the proper registration paper from the BMV.
Yeah Mike, that's similar to what existed in Michigan, but to be very clear and specific in Michigan, you COULD have a YOM plate ONLY if it was a real plate, not a reproduction, and ONLY if it was legitimate during said year. Then, if you met the criteria, you switched your "given" plate to your "YOM" plate once they did a search to see if it met their criteria, and then your registration changed to the YOM plate. I suspect that MI and OH are not the only places like that with similar rules.
NC is different. You don't have to register or declare your YOM plate. You just have to keep the given plate in the car. Yes, that simple. We are a one plate state, so my ersatz German plate stays on the front. No matter what plate I choose to place on the back of my car, the registration doesn't change. Hey, doesn't make a lot of sense to me, but I'm not arguing. [ N.B. There's a LOT of things that don't make sense to me here, like putting water heaters in the attic, and no basements, and dirt floor crawl spaces that just attract vermin. "It's code" they tell me.
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Personally however, once I do get my 1969 NC plate reading PAGODA, I will NOT take it out of state like that...just because it's legal here doesn't mean other states will accept it.