By Polaroid. Stores reference 22c/882. Intended for use when flying over water surfaces and under severe reflected-glare conditions. They provided an excellent filter for use in submarine spotting and coastal reconnaissance. The frame is made of light green tinted moulded acetate in one piece, having two semi-circular side-shield attached with nickel plated hinges. A chamois covered sponge nosepiece is stitched to the frame and the spectacles are fitted with a simple adjustable black elastic strap. The lenses are laminated Polaroid safety glass. The frame is good and all of the hinges are good, tight and function well despite minor corrosion. As with most pairs found, the lenses have delamination marks. Both side-shields are complete/good. The headstrap has deteriorated and is crumpled and stretched, retaining only a little elasticity. The adjustment buckle has surface corrosion but the nosepiece is complete and in very good condition. Air Ministry marked with reference numbers, all engraved into the sideshields. The MK.VI series were produced in low numbers compared to other goggles and spectacles making them quite rare and hard to find. Stock code G23694.