This is a single oil or vinegar cruet in the American pattern by Fostoria. There are two sizes of cruet in this pattern, and they are so close to be nearly indistinguishable. I believe this is the 6 3/8" 5 oz size. American was made from 1915-1982 and is an elegant glass pattern. The cruet is in excellent condition with no chips or cracks. Please see my other items for more in this pattern.
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Happy New Year! Best Wishes for a happy, healthy, and prosperous 2017.