Carl Zeiss ( Optics by Carl Zeiss ) Soft Square Pure Z Mod. Z021 Sunglasses

Carl Zeiss soft square classic style sunglasses, possibly vintage. Zeiss "Pure Z" lenses, Mod. Z021 brown frame with subtle green / blue tortoise shell patterning (appears to be rare, can't find them anywhere - color seems to shift depending on lighting, very subtle and hard to describe). Nice pre-owned condition, lenses are in good shape and ready to wear. Very stylish, super quality, rare find.