You are looking at a desirable older unused Amphenol female 4 pin microphone cable connectors from the 1950's - 70's. You'll see in pic # 2 this very connector type in an old Amphenol catalog. Shure 545, 545S, 565, 565S & Electro Voice 664, 644, late model 630 & 636 model mics used the 4 pin connection and these female connectors were often used as extension cables.
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