Earlier on I think (can't be bothered to re-read the whole thread

)
I mentioned the use of 'Mazareen blue' in the Offical Catalogue of the Great Exhibition of Industry of All Nations 1851.
I have just revisited the catalogue and the listing is:
https://books.google.co.uk/books?id=8FdS4CscCG8C&pg=PA124&dq=mellish+silvered+glass&hl=en&sa=X&ved=0ahUKEwigyInH6fnWAhXEL8AKHbFVDCQQ6AEIJjAA#v=onepage&q=Glass%20globes&f=falseOn page 124, Under catagory Class 24 Glass:
'19. Davis, Greathead and Green, Stourbridge, Manu.- Cut glass decanters, water jugs and goblets, ruby centres and stands, lustres, with ruby and flint drops, cut and enamelled; coloured hock, and other wine-glasses. A great variety of ornamental vases; white, opal, frosted, Mazareen blue, and topaz; painted, enamelled, cut, and engraved.'
Mazareen blue is described in this book:
Indigo in the Arab World (Jenny Balfour-Paul, First published in 1997 Routledge)
https://books.google.co.uk/books?id=51QWcY07KXwC&pg=PA117&lpg=PA117&dq=what+is+Mazareen+blue&source=bl&ots=q_Tc-hncls&sig=IaHuUECw4dNo5xDImzSWhQ2om9g&hl=en&sa=X&ved=0ahUKEwjk-KOD7vnWAhWmL8AKHVh2D90Q6AEIODAG#v=onepage&q=what%20is%20Mazareen%20blue&f=falseChapter 7 pp 117
'Eighteenth Century European dyers classified indigo colours into thirteen separate shades, beginning with the lightest:
"milk-blue, pearl-blue, pale-blue, flat-blue, middling-blue, sky-blue, queen's-blue, turkish-blue, watchet-blue, garter-blue, mazareen-blue, deep-blue, and very deep or navy-blue' (or 'infernal blue').'
My vase could definitely be classified as 'mazareen blue'.
Since Davis, Greathead and Green showed '
A great variety of ornamental vases; white, opal, frosted,
Mazareen blue, and topaz;
painted, enamelled, cut, and engraved.', I think they have to be a serious contender for my vase.
The shape is almost identical apart from the foot shape, to a shape from Richardson's (in the Corning - size and shape compared).
See also CH British Glass 1800-1914 pp 136 for a Richardson Etruscan vase in the same body shape but with a different foot (also 'chunky' shaped). So the shape seems correct for the period 1851 as well. The decoration design is Etruscan, also quite right for the period.
The making of it is very high quality, heavy, thick glass beautifully finished.
m