Here we have a nice tall heavy solid cylindrical decanter stopper. Not certain of Brand but could work on popular decanters by Baccarat, Pilgrim, LE Smith, Viking. Please carefully measure according to the below information. Ere on the size of your decanter opening being slightly larger.

Study pictures for condition and details. Good overall. No chips. Could use a polish.

5” total height

3” top portion

Stopper

Height 40mm

Width at top 38mm

Tapers down to 30mm