Fading blue spiral glass, thorn handled vase. Northwood? Stevens and Williams?

I found this beauty in a shop and brought it home. I am trying to find the maker. I am finding similar vases, definitely the same maker, on line. I have seen them listed as possible Bohemian Harrach as well as Stevens and Williams. There are no marking on the vase that I could find. The pontil is polished, filed or sanded except for in the center. It has thorn handles and is absolutely stunning. Anyone able to confirm the maker of this beauty?