6647 N.O.W. Titanium Eyeglasses by Lindberg. Color: C01, C02, C04, C06, C06G, C07, C08, C10, C11, C12, C14, C19, C20, C21, Size: 50-18-150. Optical spectacles 6647 offers a slim-rounded square lens in its tidy titanium frame—cool and composed. Spring hinges wrap temples securely around your ears without fuss. Adjustable nose pads make the fit feel custom-made. A polished choice for anyone seeking “quiet luxury”—low key, high quality.