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Those "custom series" badged sets were made from the mid '80's until the early '90's. I had a 19" knob tuned "custom series" Zenith from around '88-'89. IIRC, it used the single board 9-470 chassis. I've seen quite a few 19" sets from that time with weak CRT's. Fortunately, the 13" CRT's seem to hold up better. Knob tuned Zenith's from the late '80's and newer don't seem to be that common. If the set you got is clean and works good, I'd say you did OK.
I also remember the schools having some 25" Zenith "custom series" table model TV's that were housed in particleboard cabinets. They had a keypad style tuner; but, used a regular volume/power knob.
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