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Can you give us a pic from the other sides? Maybe that helps…
I can not. I snapped the picture a month or so ago in passing.
This isn’t the same thing, but it certainly looks like it might gave the same function
https://www.wescor.com/translations/Translations/M2551-7A-EN.pdf
What is this thing?
No clue. I found it at EPO in Houston. That place is an electronics goldmine if you go in only hoping to find old and obscure. Its amazing.