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 'AN6530' on the centre hinge. Fitted with an excellent set of AO marked clear glass lenses. The rubber cushion remains supple and is undamaged. The chamois backing has light even soiling indicating only light use. The strap is in good order but has lost much of the elasticity. A very good used pair. Stock code G21046.