purple. original colour?

[69ride]

i have a 69 c-10 that i picked up a few months ago. it needs a new cab so i started dissassembling the components off of the old cab. under every bolt and nut is this metallic purple paint. i scratch down and under that is bare metal. right now the truck is in a red oxide primer, but before that it was navy blue and under that is this purple. my father-in-law , who is a old chevy nut, insists that this is in no way an original colour. the options sticker in the glove box is long gone and the vin tells me that this truck came with a V-8, and was made in oshawa ON. does anyone know for certain that this truck was not originally purple if it is original i NEED the paint code.