Adding to my post above
This link here is a news report from 1879 and shows that Wittman and Roth exhibited Iridescent and ornamental glass as part of the British Exhibit I think at the Sydney International Exhibition if I've understood correctly (read and scroll down using the left hand side of the page)http://trove.nla.gov.au/ndp/del/article/13445525
They are listed as Great Marlborough Street London - ummm, would glassmaking have gone on in Great Marlborough street? or is it likely that is a retail outlet address?
In this report in the London Gazette, Wittman and Roth desribed themselves as 'Merchants' and state that their partnership is dissolved... that was in 1879 report stating they dissolved in December 1878 - but apparently they registered a glass item years later under the name Wittman and Roth?
And in this report in the London Gazette of 1896 it states that Wittman and Wittman have dissolved their partnership-http://www.london-gazette.co.uk/issues/26703/pages/444/page.pdf
Oh and one more thing
There is a jug here (see link) below that is reminiscent of Alisa's vase and the Harrach vase and it has a reg number on it of 39086. The blurb about it says
'Registered Design number 39086 was allocated to 'Sidney Wittmann, of Wittmann & Roth' London, described as 'Glass & China Manufacturer', on 30th November 1885. The design was described as 'Raised pattern on glass surface to imitate hammered metal'. Sidney and F Pohl, a member of the Bohemian Pohl family, apparently patented a method of making glass in imitation of tortoise shell on 25th October 1880. That would appear to date this creamer quite well ca. 1885 - 1890, as the pitcher is signed with the acid mark capital W within an Owl standing on a crescent moon. Carved & Decorated European Art Glass / all by Ray & Lee Grover; British Glass 1800-1914 / by Charles R. Hajdamach; Victorian Decorative Glass British Designs, 1850-1914 / by Mervyn Gulliver; Decorative Victorian Glass / by Cyril Manley; Nineteen Century British Glass / by Hugh Wakefield' http://www.liveauctioneers.com/item/5715096
Obviously the only link between this/Alisa's and the pink ones is if an actual pink one the same decor as op's has been found with the same reg number on it.
On the other hand, whilst the pattern looks a little more random than the pink vases, it does look remarkably similar in parts - possibly it was adapted and made less random but still the same maker?
The photos on this linked clear jug look as though it's very similar in the way it is constructed pattern wise. There's a nice butterfly on it as well if you look through the photos
(That Harrach butterfly? or is it a Webb butterfly? I get confused
And likewise a nice gilded butterfly on this pink version which also states in the blurb that it has a 'registry mark' at the bottom. Might that be 39086 I wonder?http://www.antiques.com/classified/Antique-Glass-/Antique-Glass-Vases/Antique-Fish-Scale-Cameo--Art-Glass-Vase
However, I'm not sure which of the reference sources given above are the source for the comment'Sidney and F Pohl, a member of the Bohemian Pohl family, apparently patented a method of making glass in imitation of tortoise shell on 25th October 1880. '
and who knows whether this 39086 is a presentation of the 'tortoise shell' .
This source at Great Glass shows Franz Pohl was at Harrach 1884-1900http://www.great-glass.co.uk/glass%20notes/manh-k.htm