Vintage Microphone found in Dad's Garage

I found this old microphone (at least I think it is a microphone) when we were cleaning out my dad's garage.

He was into fixing radios when he was a kid, so I would guess that this is probably from the late 30's.

It is brass colored and 4 inches in diameter.

The only markings I can find on it say "Licensed under"

The wires are very brittle from age.

T is small sliding piece of metal on the back that I think is a switch.

I will let you collectors decide what it is worth.

Sold "As Is" - no returns.

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