APPROX 3.25" IN DIAMETER

COOL OLD STOP LIGHT HAS CRACK IN WHITE PART HAS TAPE ON BACK SEE PICS 

i THINK THIS WAS HOOKED UP TO BRAKE PEDAL AND WHEN PRESSED THE LID WOULD OPEN TO SAY TOP IT IS SPRING LOADED  NOT SURE IF IT WAS  A CABLE OF WHAT . 

BRAND IS NO REX. I THINK IT MEANS NO WRECKS lol