Thais is one of the longest lasting pyrex patterns, running from 1962-1971.  It was advertised as "the theme of the decade" to go with the colonial styles of the time.  Refrigerator sets, billed as “oven-refrigerator sets,”  began in 1925, with squared-off, stackable clear Pyrex containers that saved space in the icebox. In 1949, a refrigerator set was issued in three of the colors of the first 400 bowls. The yellow was the 1.5-quart size, blue was 1.5 pints, and red was 1.5 cups. The original clear lids had fine ribs that tend to collect dirt. These sets were made in clear again from 1950 to 1952, and then in the popular Pyrex patterns of the day.
This refridgerator set is in excellent condition, please email for more information.