Vintge Military M1 Polarized Binocular Filter #7691956. , wartime accessory

Description

This is an M1 Polarized Binocular Filter. When you work the slide, the polarized lens change color. It is in nice condition, but there are some small cracks around the edges of the lenses.
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Rather than me telling you how large the cracks are, YOU look closely at the up-close photos, and you will be able to see them. Both lenses have them.
I don't know how they got there, but a shock wave from a mortar shell would probably do it.
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These filters were used to reduce glare over water and other situations.
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Check out the pics!
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