Huh, not exactly a light bulb like we think of. This is a neon glow lamp, which could be shaped (and colored). Do a search for "aerolux neon glow lamp" in google and you'll see some pretty cool stuff.
Ah! Very interesting. Thanks for the added info.! I was wondering why it was made that way...
they still make these...you can buy all kinds of novelty filament bulbs.
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