This "1885 Patent" Thomson Houston lamp has a beautiful hairpin carbon filament and the coveted "hand made knurled skirt" brass base. Look carefully at the exquisite workmanship. This lamp was made with exceptional care by gifted craftsmen, from the toolmaker to the glass blower. It is truly a rare carbon lamp, made before mass production was a part of electric incandescent lighting history. This item has a beautiful hand blown clear glass globe, platinum lead-in wires and an exceptional working "U" shaped carbon filament. This lamp was made before Edison and Thomson / Houston became the General Electric Company.