Zenith Y 4204 W "The Hals"
Hi! I'm afraid you'll probably never win the contest for your skills in photography but I think the tv you have is the model Y 4204 "The Hals" from 1968. I had the same set till two days ago. I gave it to a friend of mine. I'll ask him the chassis number. I never had the circuit diagram for this set but I do remember it is very similar to the 15Y6C15 chassis equipping the portables of that era.
Marco
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