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That is a flame seal. It looks like a standard B&W bulb with a modified front panel to hold the shadow mask. It's unusual because it also is aluminized. Glass bulbs were thinner then, they used curved bulbs and safety issues were not the top priority. That's probably why it didn't make production, heat from the glass welding warped the shadow masks.
Last edited by eberts; 04-17-2010 at 02:31 PM.
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