Rare 1974 Zenith Space Command 600Z TV

[Betamax]

Just wondering how rare Zenith Space Command 600Z TVs are from late 1974 to about possibly 1977. These are the Ultimate Chromacolor II, especially the 25 inch delta gun tube console models from 1974-75, still with the late flat-chassis with a few modules as well. The CRT in the 25 inch models was still bonded as well this late too. The Space Command 600X was 1973-74, all solid state flat chassis, all hard wired point to point while the 600Z chassis was introduced in about 1974, mostly point to point wiring with some PCB modules as well that can be easily replaced by TV service people. The 600Z chassis is all power-tuned with all with an ultra-sonic remote just like the other space command TVs produced from 1956 to 1974. I believe the 600Z chassis is the very last Zenith TV chassis to use an all-mechanical ultra-sonic remote that actually clicked as well. If you look on the back cover of your National Geographic magazines from 1974ish, you will find a picture of the exact TV that I just got with the 600Z chassis in a back cover Zenith ad for the Chromacolor II TVs-The Ultimate Chromacolor II :-) :-)