Either a manufacturing defect or a result of shock. I have a few on my 5 and regent's 21ax's. It's rather difficult to have 1.1 million perfect phosphor dots. There are bound to be errors.
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Admiral C322C2 Regent (Restoring)
RCA CTC-7 Pensbury (Restored)
RCA CTC-5 Westcott (Restored)
CRA CTC--4 Director 21 (Restoring)
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