THIS SALE IS FOR A VINTAGE DAYTON 1920'S RADIO VARIOMETER. IT HAS A BROWN BAKELITE PLASTIC CASE. IT WAS MADE BY THE DAYTON FAN & MOTOR CO. DAYTON, OHIO, U.S.A. IT MEASURES ABOUT 3 1/2" IN DIAMETER AND IS IN VERY GOOD CONDITION WITH TIGHT WINDINGS. IN THE FIRST PICTURE, THE WINDINGS APPEAR TO BE SOMEWHAT LOOSE, BUT IT IS JUST THE WAY THEY WERE MADE.