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The only 7" CRT I can think of is the 7DP4 and that was only used in the 1946 621TS as far as I know, it was also electrostatically focused so the Focus magnet wouldn't work with it.
The 8" Rectangular tubes of the mid 50's (8DP4) has a very short bell, your set obviously had a tube with a long bell. The 8AP4 is looking like the most likely suspect, out of date by the mid 50s but it would have still been readily available at that time.
It would be nice if you could get your hands on one (even a dud) and see if it fits.
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