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 us.pat.no.re.18689" 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. Your zip code will determine the actual USPS Priority Mail shipping charges.