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Looking through the Buyers Guide, the 23" (or 274 square inch) screen size is the infamous 23EGP22. It was based on an existing "23 inch" monochrome tube and has a different overall screen shape than the RCA designed rectangular color CRTs. The aspect ratio of RCAs tubes was more like 5:4 instead of the standard 4:3 associated with NTSC, they also had a bit more curvature at the edges compared to the 23EGP22.
The 1970 25V and 19V types were different from the earlier types, they had a true 4:3 aspect ratio, sharper corners, and a flatter faceplate.
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Erich Loepke
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