6643 N.O.W. Titanium Eyeglasses by Lindberg. Color: C01, C02, C04, C06, C06G, C07, C08, C10, C11, C12, C14, C19, C20, C21, Size: 49-21-150. With softly rounded rectangles and ultra-thin rims, 6643 offers timeless neutrality in the n.o.w. Titanium lineup. Titanium’s sleek resilience ensures longevity without weight. The temple design integrates ergonomics with minimalist aesthetic. It’s a “grab-and-go” frame for daily refinement.