That's not actually mine but part of Armando Serrano's collection. He's got almost every other variation as well post on this site....
http://www.pbase.com/slidevalve911rsr/myrs...polak_lic_frameHe doesn't have a backside photo of it posted but it's clear the differences on the front side.
The "Robert Brown" definitely isn't the end all verification of it being real. There were several manufacturers but when you put all the clues together you can usually tell.
Look at the "striations" by the Vasek Polak and how different they are. The first thing that stuck out to me was how sharp the edges are on the new ones and how rounded the originals were.
All in all the new ones are great for people who don't want to spend their entire paycheck on a license plate frame but they shouldn't be marketed as originals either (Which this one wasn't. It is just way outta the ball park in price IMHO).