This is a pair of American Optical safety glasses. They are also used by Mr. Yamada of the hotel and Ren Yamada of the tattoo studio Yamada. The color is burgundy and they have gray prescription lenses. The prescription is set to about 1.5, for someone with about 0.1 vision. They have been used very little and are still in good condition. I believe they are from around the 1970s. Markings: On the back of the frame: 48 Inside the left and right temples: AO FLEXI-FIT 6 M Z87 Actual Size: Lens: Width 47mm, Height 40mm Distance between lenses (bridge width): 24mm Frame: Width 142mm, Height 47mm Temple length: 150mm