Never heard of it. Don't have any wiring info on file.
Always used a continuity test to establish what each wire does. Mike cords get replaced. Usually the colors of the new cord are different from the factory cord. Learned not to take wire colors for granted.
First detail to establish is which wire is audio. Most of the time this is easy, it's the one with a shield wrapped around it.
Checking for continuity between pairs of the other wires will eventually reveal two of them with continuity. Doesn't tell you which one is for receive, you just know it's one of them.
Choose one of those two wires now, we'll call it "wire one". Checking from wire one to the remaining wires with the mike keyed may or may not get a continuity reading. If not, wire one is for receive.
And if you DO get continuity to another wire when keyed, that wire is transmit, and wire one is the common wire for transmit/receive switching. This would leave the remaining one of the first two wires as the receive wire.
And if the cord has only four wires to begin with, the shield will be the one and only ground connection for audio, for receive and for transmit.
Cobra:
Pin 1 is audio ground AND keying-circuit ground. Some mikes have only one ground wire, others have a separate one for transmit/receive switching. If so, they both go here.
Pin 2 is audio, the wire that has a shield around it.
Pin 3 is transmit.
Pin 4 is receive.
Undocumented "orphan" mikes are just too common. Learned to cope with a lack of proper instruction info.
73