WWII Era Polaroid Variable Density Goggles -With Tin

WWII US Army Variable Density Goggles manufactured by the American Optical Company under Contract No. 97265.
These goggles were designed for use by:
Aerial gunners and anti-aircraft gunners: during World War II.
They feature adjustable variable density lenses that could be rotated from clear to various shades of pink/red using a central knob, allowing the wearer to track targets near and across the sun without being blinded.