John I'm glad you see what I see. It could be the photographs but it does sit well when I compare them side by side. Could be made entirely differently when compared in real life of course. It's so hard to tell.
It arrived with another piece that dates to the 1700s so I decided to take a look down that route having reached a dead end with this one.
You are right about the shape. It just seems so incredible, hence me thinking it must date to c.late 1800s. I think I need to have another good search to see what pre-1800 shapes are out there. I know La Granja and Neuwelt used white glass to create items in the 1700s and some were vase shaped.
It's interesting for such a small piece

m