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I think only the 19" (and maybe 17 or 13" too) chromacolor II chassis were equipped with the system 3 tubes when those tubes came out...as far as I know all 23" and 25" Chromacolor II sets use delta gun tubes.
The 23" set I have was made in 1979 and has the Chromacolor II chassis...however it doesn't have the Zenith "crest" or the Chromacolor II name...just says "space command". Maybe they were making the system III concurrently and did not want to distinguish this older technology set from the new ones by calling attention to the fact it is a Chromacolor?
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