Good example of a 19th Century Brass Microscope Bullseye Lens. It sits on a weighted brass base and swivels and tilts to different positions.
The lens is in good order with no damage. The brass is tarnished in places and the lacquer has worn but it's a nice original piece.
Approximate Measurements :
Diameter of Lens : 1 1/2" (4cm)
Diameter of Base : 2 1/4" (6cm)
Length : 6" (15cm)
Height to ball : 6" (15cm)
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