Harmony House was the Sears store brand. I don't know who actually made the Harmony House melmac pieces, but they are well done. This is the creamer and sugar bowl with lid in the Catalina line by Harmony House. They are white plastic. The Catalina line was made in the 1950s in several colors. The sugar is 4 1/4" wide and 2 5/8" tall with the lid, the creamer is 3 7/8" x 2 1/4." All three pieces are in excellent condition with no chips or cracks.
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Happy New Year! Best Wishes for a happy, healthy, and prosperous 2017.