This iconic style is officially called the "Dots" pattern (frequently referred to by collectors as "New Dots"). It was manufactured and sold between 1968 and 1973. Unlike standard Pyrex nesting sets of the era, these playful mid-century modern bowls were initially sold individually rather than as a complete boxed set. The orange dot pattern specifically belonged to the smallest 1.5-pint #401 bowl. Selling in as found vintage condition, some missing paint and fading but please see photos and video!!