This is special device for a polarisation microscope allowing to position a crystal in space. It allows to determine isotropy, uniaxiality or diaxiality, optical sign, direction of optical axes and other optical properties of a crystal.
Excellent condition. Seems to be a complete outfit, though I'm not sure since I'm not a microscopist.
LOMO Universal Stage;
Top segments: nD-1,548; nD-1,647;
Bottom segments: nD-1,516; nD-1,548;
Objectives: 3.7x0.11; 5.5x0.16.
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