This is the butter or margarine tub with lid in the Old Town blue onion pattern by Corelle/Corning/Pyrex. The butter tub is marked Pyrex. It is getting increasingly difficult to find these intact with the plastic lids. The tub is 5 5/8" wide. It is in excellent condition. Old Town began production in 1979.
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Happy New Year! Best Wishes for a happy, healthy, and prosperous 2017.