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If you're going to draw statistical conclusions from the types of envelopes used, it would seem more accurate to include such tubes as the 12UP4, 16GP4, 19AP4, and 21AXP22 since it's basically the same thing as this one contruction wise. So far as I know, the 15GP22 was the only one to use that infamous flange seal. *EDIT: actually I think the CBS 205 and Westinghouse tubes used a similar design.*
Now I'm not saying that welding the CRT together was a particularly good idea no matter how it's done, but it seems to me that there are probably more operational tubes with the prototype's kind of construction than there are operational 15GP22's though there were also more of the B&W ones made.
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Evolution...
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