637106 is the last VIN in April as reported by GM. That would have been the last car out the door at the end of the second shift, on April 30th, 1969. They made roughly 13,200 Camaros during the month of May, this is arrived at by subtracting the end of April numbers from the end of May numbers. A car with a VIN of 638606 would have already been in production as of April 30th since it took about 2 days to go from a firewall with a trim tag, to a completed rear body half. Probably started its assembly on the Fisher side of the plant on the April 29th, and came over to GMs side of the plant on May 1st and rolled out the back door of GM on Monday May 5th, maybe very late in the day on May 2nd.