American Optical - Red Dot Screw
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)
Important Details
Lenses: These eyeglasses do not come with lenses, which is ideal to fit them with your own prescription or non-prescription lenses. To make lenses that are a perfect fit, your lab technician will use a tracer machine that traces the shape of the frame for the exact measurements.
Hinges: 7 Barrel/Non-Spring
Note: Does NOT come with a case or accessories unless otherwise specified.
Frame Measurements
Lens Width: 54 mm
Bridge Width: 20 mm
Lens Vertical: 41 mm
Temple Length: 140 mm
Overall Frame Width: 142 mm
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