First introduced in 1956, this is a hard-to-find four piece set of gorgeous Pyrex turquoise mixing bowls. There are some utensil marks inside the largest and the second smallest bowls. The exteriors of the bowls have beautiful glossy color. There is minor color loss along the edge of the largest bowl. The color loss on the rest of the bowls, however, is only apparent when held directly up to the light. I have taken photos (last 3 photos) in florescent light to illustrate this. The second largest and the smallest bowls show virtually no wear. They are numbered 401-404.