Found this while thrifting. The cable is for a sennheiser hd 203 headphones. Even having the headphones I cant find anything about this cable online.
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Looks like a proprietary 4pin XLR connector. Search for “Sennheiser 4 pin cable” if you need a replacement.
Might be a 4 pin M8 plug (sensor /actor cable) given the size. I think xlr is larger.