thoughts and opinions for what they're worth..........

the leaves and possibly flowers look to be stylized convolvulus, which was a common subject for decoration, along with water lilies and other large leaved plants during the period 1870 - 1910 ....... a nod toward art nouveau - although my thoughts are that these glasses don't have that sort of age, but I could be wrong. With glass, copying is prolific, so can be difficult to know whether a piece is period or a later, and bearing in mind the size of these it's very possible that they were made as decorative only rather than for use.
Some really big names both in U.K. and continent used floral and leafy adornment for top and bottom end work during this period.
Looking at what is being suggested as etched, I'm not sure it is. If you blow the pix up, the matte areas appear possibly too granular for acid, and are possibly sandblasted, but can't make my mind up which would have been done first....... the cutting or the sandblasting - you'd assume sandblasting, otherwise the matte would encroach into the cut mitres, but not sure.
the slightly everted rims might suggest these aren't recent, but that's probably an unreliable suggestion, and the lack of a backstamp probably means you'll never discover the maker, unfortunately.
You don't mention wear Graham - many here believe this has a dubious value when dating, but with care can have it's uses in suggesting whether made yesterday or 1916.
attached are couple of pix showing very similar types of decoration etc..... finger bowl and unlidded sugar (both unmarked) ....... so if you can date for me I'd be grateful
