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That's going to be a little tricky to ID because Zenith used that exact same cabinet style for CCII sets as well as system 3 sets. I don't see the words "solid state chromacolor II" under the "Zenith" name; so, that leads me to think it uses the system 3 chassis (probably a 9-160 based set). However, the very last CCII's didn't have the "SS CCII" wording on the front.
Looking at the back will tell the story. The CCII's had an old style interlock type power cord with a red circuit breaker (reset button) above where the AC cord enters the back cover. This will be in the bottom center of the cabinet. The system 3's had the AC cord going directly into the cabinet and it will either be on the left hand or right hand side of the back.
If this is a CCII set, I highly suspect it is one of the last from '78-'79 and will likely use the inline tri-focus CRT. When Zenith introduced the system 3 chassis in '78, they also made some 19" CCII's that used the same inline CRT as the system 3.
For $20, I'd be real picky. If it is clean and produces a good picture, it would probably be worth getting. If it were a CCII, that would further convince me to grab it. Those 9-160 based system 3's produced a good picture; but, they can be harder to troubleshoot than a CCII and those 9-160 modules are getting scarce. Also, those inline CRT's don't hold up as well as the older delta gun tubes. The 19" version holds up much better than the larger ones; but, I've still seen my share of weak 19" inline Zenith CRT's. They are still no where near as bad as the '90's Zenith tubes.
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