Looking downward at the top of the unit. I doubt that this battery is from 1953.
Look closely toward the center-right of this image. There is a yellow wire that has been clipped. This combined with the newer battery being soldered in place and some random electrical tape make me believe this has been repaired at some point in the past.
Soldering iron burn on the brown wire?
Fine adjustment on one of the modes.
I'd say this is an interesting piece of history to keep around. I don't know that I have enough of a use for it to bother replacing the caps so that I could fire it up.
I was able to find the manual for this unit. Like most manuals of the time, it includes calibration instructions as well as a full schematic. You can download it here if you want, but it is a rather large pdf file at almost 30MB. That should help if I do decide to make any repairs!
— Caleb Kraft, Chief Community Editor, EE Times
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