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It probably wouldn't be dual filament. Old sewing machines of years gone by had a 120v incandescant bulb with dual contacts like that. It looks like a c-7 christmas bulb, but with a dual contact bayonet base. Also used in vacuum cleaners I think. It would be probably a heat-producing bulb. I dont remember running across this in a radio. If you have 120v between the pins, this might be it. I have seen lots of radios with a similar bulb, but with a screw base.
Hmmm..... could it be neon?
John
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