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Most likely a manufacturing defect, I have also seen this in CRT's that have been rebuilt. I have a Zenith roundie with a Channel Master rebuilt 21FJP, that has a small error, that is hardly noticeable. All it would take is for a small chunk to fall down onto the mask, during the neck removal or reinstallation process, especially during rebuild.
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[B]"Bee care-eh-full to don't broke thee pic-sher tee-yube!" :-)
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