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It looks to me like in the scanned pic above for the ad there is black in the bezel as well. I think it was just painted on, and if you cleaned and polished them a few times it started to go away. Could some cars have come with all chrome, certainly, don't know, but I think this was part of the safety mandates started in 68 and phosed in over the years, eventually to include side lights, big bumpers etc.