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Hi, my 1972 K1 is black and not an American import.
http://www.honda4fun.com/pdf_parts_list/pdf_spac500/CB500_76-K-K1-K2/CB500K-K1-K2_05.pdfp.73 denotes which markets had that colour: D, E, ED, F, G, H and U.
That black one in the Pic