This is a white milk glass Fenton Hobnail mustard jar, the base of the jar only. I do not have the lid. This jar can be found with both glass and wooden lids, and a clear glass spoon completes the set. The jar is 2" tall and 2 1/2" wide at the widest point, 2 1/8" wide at the mouth. It is in excellent condition with no chips or cracks. It is not signed or marked, so it predates 1973 when Fenton began marking everything,
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Happy New Year! Best Wishes for a happy, healthy, and prosperous 2017.