Rare vintage mid 1950's unmarked Corning Glass Co. Pyrex True Opal white glass mixing bowl set. #404 four quart, #403 two and a half quart, #402 one and a half quart, and #401 one and a half pint. 10 ½", 8 ¾", 7 ¼", and 5 ¾" in diameter. 4 ½", 4 ⅛", 3 ⅝", and 3 ⅜" tall. Unmarked, bottoms only have mold numbers. In excellent condition for age, these were well taken care of with only minimal use wear, some light use scratches on inside bottoms ( see last 3 pics ). Largest bowl has a light stain line on inside middle (see video) that I couldn't get in photos, it's hard to see in regular light (I have very bright lights in my studio). Weigh 7 pounds 11 ounces. ***No bundling on this item because of weight***