The field sequential and NTSC systems are completely different. You would see nothing but a jumbled mess on a CT-100 if you tried to watch field sequential. Horizontal scanning rate on the CBS system is 29,150 Hz vs. 15,575 for NTSC. Vertical scan rate for the CBS system is 144 Hz vs. 60 Hz for NTSC.
Yes, they are the Zenith sets:
http://www.earlytelevision.org/field...rototypes.html