Set of M1 WWII binocular polarizing filters for some US Army & Navy binoculars

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Set of M1 WWII binocular polarizing filters for some US Army & Navy binoculars:
$9.00

These clever filters apparently snap onto the eyepiece rims of some US military WWII binoculars so that the user could reduce the glare when looking toward the sun.

The rotating mechanism still worked properly, but the polarizing lenses appear to have lost some of their effect in the middle.

$4.00for US Mail; $9.00 for Canada; $14.00 for International Mail