OEM Clear Protection Filter 6.6x6.6" 168x168mm 4mm
Clear Protection 6.6x6.6" Filter
Such filter protects a lens from damage and dirt (water drops, for example). Colors and brightness aren't affected.
I don't know manufacturer. The filter seems to be non-coated.
Size is 6.6x6.6" or 168mm. Thickness is 4mm. Seems to be unused, wrapped in cigarette paper.