Right. Looks just like this NE2 on ebay for $1.28. A similar one with a screw base was an NE51. They are current devices, just like leds. The drop across the bulb is around 65 volts as opposed to the 2 or 3 volts of an led. Unkike an led, they are not polarised and work on in both halves of the AC cycle. When they get old they start to flicker

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