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Here's a link to a company that sells vintage tags. It might be cheaper buying new ones than restoring old ones. http://www.licenseplates.tv/
Haven't had one done, but I'm about to do the antique, correct year plates for my 73. Media blast, fix a few scars with bondo, prime, repaint. Too easy.
I've tried that - and have lots of body/paint experience - not that easy and they just don't look real in the end. It has to do with the raised letters and the piant on them - hard to get right. Maybe you're better tho!