1969 proto type Z-28

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I was talking to a friend last night who was telling me about a very early 1969 Z-28 that was a proto type he once heard about. The car was gold with white interior had no trim tag and if he remembers right it had a serial number under 500010 It sounded very interesting as it seemed it used some 1968 parts on it since it was not only the proto type 69 Z but also one of the first 69 Camaros. Does any body else remember this car or heard any stories about it.