ZhS-17 
33mm yellow lens filter
LZOS, USSR

Very good condition. Fully operational. There are no cleavages, scratches or fungus. There is a bit dirt at the edges. The rim has small signs of use. 

Lens "Industar-50" is not included and shown as an example of mount. 

This filter has 33x0.5 mount and is designed for popular USSR lens "Industar-50" and others.

This is a classic yellow filter with medium power. Its aim is to weaken blue light and atmospheric haze. When taking picture of blue sky with clouds the filter intensifies contrast, blue sky becomes more gray. Also it strengthens the distinctness of far objects and contrast of shadows.

Yellow effect is expressed more when taking photo at natural light and less at artificial light.

If you need less powerful yellow filter, you can use ZhS-12 which has lighter effect.
If you need more powerful yellow filter, you can use ZhS-18 which has stronger effect.
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Weight - 7 g
Mount (mm) - 33x0.5
External size (mm) - 35x6