I’d put my money on very early. The vast majority are the red center. If we figure they made ‘64s for 11 months, is one out of every 11 on ebay black? Maybe, not many more than that. (Edit-just checked 3:34) Probably ran into a manufacturing issue and bailed out quickly. That adds up to September, maybe October. The Motor Trend article was January so they must have tested two months before, red by then.