Pyrex Snowflake Divided Casserole Dish A 1.5-quart oval divided casserole dish in white opal glass featuring the Turquoise Snowflake pattern with a matching clear glass lid. Introduced in 1956, Snowflake was one of the first two printed patterns released on the new oval Pyrex shapes. This turquoise-on-white version was produced alongside a white-on-charcoal version to appeal to the modern aesthetic of mid-century American kitchens. It remained in production until 1967 and has since become a staple for vintage kitchenware collectors.