Interior Paint Gloss Finish?
found this
Another ImfamousJIM 1970 Plymouth Duster post... Photo 6739335
I may be remembering just the dash. Hard to tell but the door sill piece doesn't seem to be glossy like exterior paint is ~ here's one with black, again hard to tell
http://ipocars.com/imgs/a/h/i/r/n/plymouth__duster_1970_4_lgw.jpg
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