[Mr70]

Chris that plate is missing the Apostrophe S after America..

Today I can buy this that same $202 Ebay plate at my Chevrolet dealer $6.00
It is nothing more than a variation off the original vintage design and not an authentic Original Vintage period plate.
In short,it's a later knock off,albeit sold through a Chevrolet dealer.
To add to what others have stated,other easy knockoff giveaways are the fact that it has the Chevrolet Bowtie emblem and See Americas First slogans embossed.
The originals were flat there,not to mention it's showing the aftermarket makers mark on the bottom left corner.
To be fair,the seller did not state "Vintage" and he did post very clean,clear,close up pictures to show the buyer what he is actually getting.
NOS does not automatically mean 40 years old.
I would hold the buyer to that amount.