From my Aunt’s estate in Wisconsin, this Vintage Solid Round Cobalt Blue Glass Bottle Decanter Stopper 4” Tall. The end of the stopper is 1.25" in diameter and towards the top of the stopper it measures 1.5" in diameter. Please see the pictures for additional details. Let me know if you have any questions. I am listing other vintage items from her estate so check out my store! I am always happy to combine shipping.