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I don't know anything about the Victor brand.
The Heathkit is older because Nixie tubes were used before LED displays were used. Also the corrosion on the BNC is not a good sign,
My first counter was similar to that B&K. The display on mine became unreliable, I believe because of a connector issue. My model didn't go very high in frequency so I decided to trade up.
Note that both the Heathkit and the B&K used a power cord connector with
round pins, unlike the common power cords now which have flat blades.
I not wild about any of those three.
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