I have been doing some more searching on this - after many years of researching and reading

- and come to a conclusion.
I've found a vase (no longer listed unfortunately) that was sold on ebay in 2019. It's marked Richardson vitrified and I believe it is one of the pieces as quoted in Jason Ellis's book page 327 which references that W.H., B. and J. Richardson were awarded the Royal Society of Art's Gold Isis Medal in 1847.
https://picclick.co.uk/W-H-B-J-Richardson-Vitrified-Blue-392204127851.htmlThe reference is part of a longer piece but I'm quoting the part specific to what I believe is the vase I've seen listed on ebay:
Quoted section removed as requested by OP.This piece quoted refers to 1847 and of course Richardson may have continued to improve it's coloured glass by c. 1850 ish, but there is nothing in the whole information on pages 326 and 327 of that book, nor anything I've seen or found over the years of searching for this, to indicate Richardson's were producing the colour of blue opaline glass of my vase around that time.
For the moment then, I conclude that although the shape of the vase and top neck and rim are remarkably similar to many Richardson white opaline 'Etruscan' vases produced in that period, this was not produced at Richardson's glass c. 1850.
I don't think it is English glass because of the blue opaline and the shape of the stem and foot. If it is English, I think it can only have been produced much later because of the blue opaline but against that however, it's my opinion the enamelling and decoration and the stem and foot leads me to believe it was produced c.1850 ish.
So, off to other climes with this one
