Someone slipped a Mickey into my octal socket

My guess is that this was a selector switch of sorts; a plug or transformer could be inserted one of two different ways to achieve two different connections. But the socket looks like it was manufactured this way, not modified after the fact...

Can anyone confirm or dispute?
 
Very Interesting, cant say I have ever encountered this.
One get in trouble with it for sure....
 
Very Interesting, cant say I have ever encountered this.
One get in trouble with it for sure....
This is the only EBY octal I've seen IRL and it's a very nice socket. I won't use this one, though... too much potential for error.

The ones I've seen online don't have the extra keyway. I want some of those!
 
Sure! Or I could put it in the bin o' sockets and wait until a matching Mickey socket shows up in... ten? fifteen years? :)
When it happens -- you'll score a pair. Then what will you do? What will you do?

Here it comes... the egocentric aside 🤦‍♂️
This isn't hypotherical. This is why I have most of five Electrovoice Esquires.
EDIT: I tell a lie. Actually four, but five makes for a better tale in the context of stereo and, you know, Dolby ProLogic and whatnot...
 
When it happens -- you'll score a pair. Then what will you do? What will you do?
I'll tell you what, mister!

I'll score that pair and then I will use them!

I will use them as God and EBY intended, as a nifty proprietary dual speaker impedance selector plug thingamajiggy for 8 ohms output at one orientation and 16 ohms rotated ninety degrees from that and I will make me some very special proprietary speaker wires with octal plugs on the ends of 'em and maybe bananas or spades or maybe even just bare wire on the other ends of them and then I will promptly cook my speakers when some jackalope plugs my proprietary speaker wires into a high voltage tube socket like that time I put a 6L6 tube in the rectifier socket of my McIntosh MC30 amp and nearly cooked my monoblock amp and then when it made terrible noises I turned it off super quick and then I just turned it back on again like an idiot and did it again!!

That's what I will do, so there!!
 
I'll score that pair and then I will use them!
On a slightly more serious note...imagine if one of those old microphone transformers were wired internally where, by reorienting it to a different keyway, could change the set of windings used. Other than a dual-socket plug (as was just posted), that would make for an interesting use of it.

Here's a wild guess. I wonder if that dual keyway was designed for military use. Things are designed to be quickly field-replaceable, with zero error. (Similar to parts we used to sell with US military "ordnance" part numbers assigned to them.) My thought is that if part of the first key were to chip off the "plug" end, there would still be a full second pin to be sure it's oriented properly.
 
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