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The 23XC38Z number gives two clues:
No AFC, or it would be a 20X1C38 but the 20 versus 23 is a tube count.
The Z-suffix is usually denotes an extended run, sunset models before discontinuation.
Zenith's last 21" round model 24NC31 was a 1966, 24NC31Z is a 1967 model. Rather than a new "X" series, the roundie was extended one more year to use up 21" round CRT's no doubt.
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"When resistors increase in value, they're worthless"
-Dave G
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