[Ls6 Ragtop]

I too have been trying to date these 1-USA Chevrolet plates as I have some of these NOS. My black background plates have the letters painted with the old sand based reflective paint so when light hits them at night they kind of look illuminated. Really cool plates. I've also seen 60's vintage photos of race cars sporting these plates, I believe James Garner had them on some of his road race Corvettes back in the 68? timeframe.
Sorry Brad, not meaning to hijack your thread.
Chris