Why are 1960s Zenith TVs so rare on the west coast?

[Electronic M]

Zeno brings up an interesting point. I currently somehow have 2 Packard Bell roundys.
One is a 1962 and looks like RCA shipped them a then several years old stock CTC-7 or CTC-9 chassis (I haven't dived in to the resto on it yet since I'm waiting on the previous owner to send me parts he forgot to load) PCBs and all, and then PB modified it to accept their computer light tuner and remote control system, suck it in a custom cabinet to accommodate the tuner and remote and made it work with a 21FJP22....

My later 1964 PB is the one with the doughnut chassis that is built like a Zenith (and like the rectangular PBs Zeno is thinking about) the circuits while RCA influenced don't appear to be a direct copy of any RCA chassis.