Vintage Working GE Mazda Tungsten Filament 40 Watt 110 Volt Light Bulb

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Vintage Working GE Mazda Tungsten Filament 40 Watt 110 Volt Light Bulb:
$19.99

Up for sale is an incandescent light bulb that I\'m guessing is from the mid 1920\'s to early 30\'s. I tested it at about 50 volts, and took the picture. It has a brass base, in which someone scratched \"40W\", and some of the markings on the top are still legible including the GE logo, Mazda, and what might be the remains of Detroit Edison Company. You can see from the picture that it has an non-coiled Tungsten filament, and tipless glass bulb. Thanks for looking!