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That isn't a BNC; it's called UHF or SO-239.
You can calibrate it against another generator that you trust by listening to the beat between them. You also can use local AM stations as markers.
I am sure it's simplicity itself; the company wasn't known for sophistication. So you probably have an oscillator tube in a Hartley or Colpitts configuration, an unregulated power supply, and a simple oscillator for modulation. Maybe three tubes in all.
My Precision E-200 is very accurate. It's also for sale.
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