That's odd and neat.I found something interesting on my old 67 Belvedere while sanding it down. It wore the original white paint. But what was under the paint was interesting. Still to this day do not know why it was there. But here is a picture of what looked like a factory pin stripe, covered by factory paint. the line was green seperated by a white pin stripe. Best visual is lower right side of this picture.View attachment 390194
Lol.I found this on the doors of my '68 RR.
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