Commercial carbon filament lamp, possibly of European make. Brass bayonet base with collar, fiber insulator, nubs instead of pins, brass contact ring, two dimples on opposite sides. Single-arch carbon ...
Carbon decorative lamp (Japan), about 1920. Brass miniature-screw base with glass insulator. Single-arch carbon filament with carbon-paste connectors, Dumet leads, flat press. Tipped, P-shape envelope ...
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