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I'm sure dieseljeep is correct. I think Goodwill just listed it as 15" because that was approximately how they measured the screen diagonal with a ruler, not because they knew something specific about the CRT. Keep in mind that CRT screen sizes used to be based on the dimensions of the entire tube envelope, not just the actual screen area. So, 15" would seem perfectly reasonable for someone describing it who isn't otherwise familiar with the item.
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