Took a look at the '64 and '65 road test articles to see what they might tell us. For '64, all of the two-groove w/p pulleys were plated. The single-groove pulleys were painted black. For '65 I only found one picture of the w/p pulley. It was a two-groove pulley and it was plated.
I also located one '66 two-groove pulley that was plated. This may reveal a pattern.?.?
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