Ed - Can't explain the date code, but as a matter of interest, we built all the '69 Corvairs off the main line, in a Pilot Area in the back corner of the plant, by hand. When the volume dropped below 5 per hour in late '68 (thanks to our buddy, Ralph Nader), we knew the car was dying, and moved the Chevrolet final assembly operations off-line at three per hour until the car was finally cancelled.