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,
maintained the proper tension while opening: maintained the proper tension while opening
closing the frames. The red dot mark is on a tubular rivet of new design: closing the frames. The red dot mark is on a tubular rivet of new design
which incorporates a nylon bushing. A precision machine is supplied to seal the rivets in hinges that have been drilled: which incorporates a nylon bushing. A precision machine is supplied to seal the rivets in hinges that have been drilled
reamed. The machine will accommodate 3-, 5-,: reamed. The machine will accommodate 3-, 5-,
7- barrels,: 7- barrels,
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: 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
closing of temples satisfying): closing of temples satisfying)
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