As Neil undoubtedly knows, any unmarked piece decorated with Greek keys (especially if part-frosted) is often reflexly attributed as 'Molineaux & Webb' or at least described as 'Manchester glass', and there are certainly lots of pieces with an additional single row or multiple rows of those pesky circles so attributed without a shred of evidence to back it up.
To complicate the matter further, I attach a photo (copyright mirandus) of a similar unmarked sugar & cream, and a similar unmarked comport but with a part-stippled (rather than part-frosted) finish.
I've looked through all the extant Sowerby pattern books without finding a match.
It's certainly not a Davidson registered design, and neither does it feature in their catalogues of unregistered designs 1880-1890.
One never knows, but I think the chances of firmly attributing this particular design to a particular manufacturer must be very slim indeed.
There is a fascinating illustrated catalogue from Robinson, Skinner & Co., Warrington, dating from somewhere between 1870 and 1900 accessible online at
http://www.cmog.org/library/sales-catalogue-24and downloadable as a .pdf file at
http://d3seu6qyu1a8jw.cloudfront.net/sites/default/files/collections/FB/FBD851CA-36A2-42EE-A42C-FBF0980D1535.pdfthat shows a multitude of designs of all types of glassware decorated with a veritable kaleidoscopic array of just about every Victorian design element (singly or in combination) likely to be encountered. Some of the designs look suspiciously similar to those from the more commonly encountered glass manufacturers of Manchester and the north-east of England (even though Robinson, Skinner & Co. registered very few of their own designs).
There must have been loads of catalogues of catalogues of Victorian glassware that will never see that light of day ever again and, although I don't have access to them at the moment, I imagine that a perusal of the glassware sections of the Silber & Fleming catalogues reveal a similar plethora of designs that may repay examination.
Fred.