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I have a 1968 consumer reports TV issue where they claimed that was the first year for the revised CRT sizes.
All 66 and 67 sets I've owned still had the old CRT designations used since the beginning of time.
When they switched to the viewable area designations the first letter in the tube number was always V...I had a CTC-20 roundy with it's original 19V something CRT that was literally a renumbered 21FJP.
Most tubes lost 2" when the law went into effect.
The first real 25" tubes came out in 1970.
Before the switch 22JP23 CRTs were a thing.
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