Vintage B&L Ray Ban Bausch & Lomb DGM Ambermatic Powderhorn Sunglasses w/Case

True vintage Ray-Ban Bausch & Lomb USA Powderhorn ski sport sunglasses circa 1970's. Made in USA. Unisex. Ambermatic mineral glass lenses with silver double gradient mirror (DGM) on the outside. Gold mirror on the inside. The lenses are made from pure optical glass and are ground and polished to precision-optics standards. Pre-B&L etching, non-prescription and ready for wear with 100% UV protection. Ambermatic lenses are made of light-sensing glass that self-adjusts color and density for varying light & weather conditions. Color changes from haze-cutting amber under overcast skies to glare-blocking brown under warm sunny conditions or dark gray under cold sunny conditions. Retro cool acetate/nylon frame features 3 layers of coordinating hues: tan, white, and navy. The inside right temple is impressed with BAUSCH & LOMB U.S.A. The inside left temple is impressed with POWDERHORN. Right lens has one speck of defect and left lens has one scratch. They don’t show when you’re wearing the glasses. See close up photos of each lense. There are slight hairline scratches to the frame. Left arm is looser than the right. Frame: 142mm L x 54mm H Hinge to Hinge: 134mm Temple: 140mm Lens H: 50mm Lens W: 56mm horizontally Lens W: 60mm Glasses are in excellent condition for their age. I took many photos in different lighting/settings to show these off as well as I could. Case is new.