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Carbon/Graphite Pole/Electrode from an old Battery.
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I do believe you are Correct..Not to throw a wrench into the ID, but the carbon rods from old-school telephone batteries didn't generally have a rough-surfaced irregular tapered point.
I believe it is a carbon rod from an "Arc Lamp", popular light sources before lightbulb technology was improved enough to replace them. Used rods from arc lamps always seem to have that sort of tapered point.
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