Re: Mystery item!!
I tend to agree that the wander plug terminals aren't part of the original design, but their type/appearance potentially dates back to the early thirties so the modification could have been a very early one...and were they an add-on or did they replace broken terminals of another type? Also intrigued as to the significance of the peened over brass bezel. Note the (modern) owner's label inside the lid, so Mr and/or Mrs anon presumably coveted it.
I would go for a therapeutic item* or a piece of test gear with significant bits missing.
*Perhaps the patient was supposed to grab the brass bezel..?
Dave
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