1980s Arcoroc Octime Black Glass Mugs Set of 4 France

Black glass octagonal mugs from Arcoroc's "Octime" collection. These look like opaque black mugs until you hold them up to the light! They comfortably hold 8 oz. Measurements: Height: 3 3/4 inches Diameter: 2 7/8 inches Width (w/ handle): 4 1/4 inches Condition Notes: Each mug is marked with a different number on the bottom: 6, 7, 52, and 60. The mugs marked "6" and "60" show minimal signs of usage. The mug marked "7" shows a 1/4 inch scratch on the panel counterclockwise of the handle and a few small scratches on the panel to the right of this one (photo #9). The mug marked "52" has some small scratches on the panel two panels counterclockwise of the handle (photo #8).