It is a very big discrete resistor 2KΩ potentiometer with sliding brass(?) contacts. So there is no click sound when it is rotated and rotation is very smooth.
It reminds of Daven or Shallcross potentiometers but it is much much bigger. Almost half the size of a shoe box.
Built quality is amazing.
World class potentiometer.
It must have been used in projection theater, cinemas etc.
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