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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.
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.
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