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They used different materials in the mid 70s.
I've gone back and forth with someone here over the years (I don't remember who it is) about this.
I had a '78 SC with chrome trim. It was chrome plated brass. I knew it for a fact from the metal shop when I got it rechromed. It was original chrome plated brass from the factory.
Some people insist that the trim was, by the mid 70s, always aluminum.
Not true.
My guess is your car may have come from the factory with chrome trim. And that over the years, someone "blackened" it out.
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