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Looks ham and egged (mmmmm...ham and eggs...).
It will work, but the 1B3 has more headroom in the peak voltage spec and a tiny bit more current than the 1X2.
In a B&W TV, the lower HV rating of the 1X2B may not be a problem. But I'm sure it did work fine.
Strange though that it was modified. The 1B3 is still plentiful even in the year 2020.
John
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