Wait a minute; MARK 8? If they're counting the CTC-2 (CT-100) and CTC-2B (21CT55) as the same chassis, the CTC-12 is the 8th production chassis!!!!
CTC-2 (2B)
CTC-4
CTC-5
CTC-7
CTC-9
CTC-10
CTC-11
CTC-12
Charles
***By the way; there IS a CTC-3. Hats of to the first person who can post what it is, and why it's a trick and isn't counted in the list! ("seasoned" color TV history guys please hold back)