By American Optical (AO). Excellent frames with only light wear to the plating. These have the less common 'tube' vents on the frame. Stamped with 'A-N6530' on the centre hinge. Fitted with an excellent set of AO marked amber glass lenses. The rubber cushion remains completely supple and undamaged. The chamois backing has only very light soiling. The strap is also very clean and retains some elasticity. An excellent lightly used pair. Stock code G21249.