American Optical

Size: 54□20 140

Color: Brown

Shape: Square

Material: Acetate

Condition: Pre-Owned. - In pristine condition very well built 7 barrel hinges vintage American Optical frame with red screws, In 1955 American Optical introduced the Red Dot System or red screws to help ensure the screws for their vintage frames did not get loose or fall out, and maintained the proper tension while opening and closing the frames. The red dot mark is on a tubular rivet of new design and which incorporates a nylon bushing. A precision machine is supplied to seal the rivets in hinges that have been drilled and reamed. The machine will accommodate 3-, 5-, and 7- barrels, and assures the right amount of expansion of the bushing to guarantee a firm hinge tension that will not change with use. (This frame is a high quality 7 barrel hinges which makes opening and closing of temples satisfying)