This Japanese Mura DX-20V Microphone, is for Radio, Voice or Music. It is Hi & Low Impedance 500 Ohm & 50K ohm with a switch.
It will also work with Vintage Amatur Radio Transmitters and Transceivers.
It is very slim and 10 1/2 inches long.
I have tested this one with a guitar amplifier and it sounds great.
It comes with a long cord with 1/4 inch plug.