New for 1957, Snowflake came in three variations: turquoise on white (opal), white on turquoise, and white on charcoal. Because Pyrex black is always a satin/matte finish, it is referred to as charcoal. Of the three, white snowflake on charcoal had the shortest lifespan, dropped after the 1960 catalog. Perhaps because, like Terra that came after it, it seems to glaringly show evidence of everything with which it comes into even casual contact. You don't know how hard it is to find this snowflake version in perfect condition. Or maybe you do. But this one is.