Aint this a laugh? (vehicle registration)
It's simple here in Iowa. You can run a "year of manufacture" plate as long as the registration says "antique" under usage. I pay the regular yearly rate and don't even have to register the old plate with the DMV. I DO have to carry the state issued plates under the seat in case I would get pulled over.
I found the original plate number on the original title to the car. I had repro tags made with the original plate number.