Hi , this glass is 8cm ht and 6cm wd ,it has one of those round rough pontil marks and the base pushed up .There is good wear for a piece that’s so delicate and a blip on the rim when it was cut and worked on .If it wasn’t opalescent I think I would be looking at an earlier date because of the small bubbles and inclusions and it does have a ring when flicked,so I don’t think it’s soda .My first thought on it’s date would be late Victorian and I’m guessing it was made as a drinking glass ,but it may not be ?Does anyone know when this type of opalescent glass started being produced,any other thoughts would be welcome….thanks