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Actually that spot size 1.5x the phosphor dot size is a post 1970 thing. In 1970 Zenith introduced the Chromacolor black matrix CRT. In black matrix CRTs you can have dot size larger than the phosphor because there's a black guard band where the screen is unable to light...in the older CRTs you had to underscan the phosphor dots to keep from illuminating the space between the dots or adjacent dots since that space could have a random mix of phosphor from imperfections in the phosphor deposition.
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