Stopper #14…. Vintage Unmarked Art Glass Bottle Stopper Hand Blown. Possibly for a decanter, Perfume bottle or vinegar/oil fruit. Just sits on top.

Measures 3 1/4” long. Tapered is 3/8” down to 5/8” at pontil, center is 1 1/4" at it's widest. Stem is as shown. See all my pictures. Ships same day from Indiana.