Vintage PYREX Corning Ware SLATE STEEL Blue Milk Glass COFFEE MUGS Set of 4.

2 each of two different shades of blue. There are some small scratches and scuffs to the paint. Close-ups in photos #9-14.

Each mug weighs just under 10 Oz. The capacity, to the brim, is between 8.5-9 Oz. So, realistically they hold around 7.5 oz of your favorite beverage.

There are two different markings on the bottoms. One has a prominent PYREX, with Corning, NY small and at the bottom. The others say Corning/NY only, no mention of Pyrex.

Late 80’s to late 90’s are my best guess for the age of these colors.