It probably needs a recap and calibration at minimum to work properly. These were what TV repair men used in the 50s-70s and they are usable but solid state scopes from the 70s and newer will be much easier to use, can be found working properly for $50-75 and the recap you'd do on yours will cost more in time and parts than a better newer one.
Tube most all tube scopes are best saved for people with a tube scope fetish IMHO.
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