Hi There, been years since I have been here but there where 8 pre-production GT/CS cars all 8 were bucked on the first of Feb 1968 and all built by the 13. I have a GTCS built bucked on the 1st and built on the 13 and my Marti reports says it one of 8. It loaded with options, consuls top and bottom, Aircon, power breaks, Power steer, discs/drums, 289 and C4,rear window demister, Tacho Dash, Clock. A real demo car. Its in New Zealand