1965 Dodge Dart Charger

Last night I found the last of the four tail lights on my car.

When I checked the ones I have, I found out that for some strange reason all of them are marked by a marker pen!!!!!

The backside of the tail lights have some kind of finish. I'm not sure of it's pained or dipped. On a closer look I was wondering if it's cosmoline!!! On two of the tail lights the color is greenish and on one kind of goldish!

Does anyone have any info about this?