The NCRS docs say production date and I believe that to be correct. My #1 '67 Z was built on 12-29-66 and not shipped until 1-13-67. I don't know why there was the delay in shipping but the other '67 Zs built at this time were also delayed for shipment. I have a document from Vince Piggins' files that shows the date ordered, date built, and date shipped and the NCRS document I got had the same production date that Piggins' document said.
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