Hi Christine,
i did see a range of similar bottles (deco style) to this in one of the charity shops , and a month or 2 ago, i
saw a selection of similar stoppers (new) , I remember thinking , what a great idea if you had a nice bottle,
lacking a stopper, they were in all sorts of colours, with flecks of gold, twisted, Murano style ,
Im sure this is one of them.
Regards
Andy

(I remember the stoppers were shaped so that they would fit a range of neck sizes, wide at the top,
thin at the end)