Bohemian 37cm. Uranium Glass Vases.

I've just bought these stunning 37cm./14.5" vases. They are both in excellent condition with no chips, just some wear to the decoration. One has a VI Roman numeral mark which might indicate a Loetz piece, the other is unmarked. I'll defer on giving an attribution for now but I am leaning towards Harrach. I've now found several similar vases online described, wrongly I think, as " Bristol Glass". Although opaline glass in this style was made in Bristol during the 19th. century I think most of the pieces are in fact Bohemian.