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Im going to take a stab at this .
I would say that most of the porthole sets would have had the picture filling the whole CRT face . If not some early TV buyers might have thought it to be defective compared to a masked set .
Also , the sync pulse lines at the top and bottom of the screen might have been annoying .
I still don't have any porthole sets , but if I did I would run them full screen also .
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