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banker's lamp

n. A distinctive type of desk lamp, usually with a solid ornate base and a single stem leading to a horizontal (usually green) cover.

Wikipedia
Banker's lamp

The banker's lamp (or Emeralite) is an iconic style of electric table lamp characterised by a brass stand, green glass lamp shade and pull-chain switch (though modern versions may make use of alternate switch types). Other examples feature amber-coloured glass.