it looks very attractive - and assume you've been looking through Hajdamach in view of your comments about Pall Mall machine etched designs - which this certainly isn't - though some aspects of the design seem unusual for the Edwardian period.
The 'snail shell' stem is a Victorian style, and despite looking through Hajdamach I can't find a single glass from the Edwardian era with a similar stem - then there's the engraving of ivy - vy and convolvulus were, apparently, more typical of the 1850 ish period.
If the foot is flat then there should be some evident wear after 100 years, unless the glass stands on the very outside edge of the foot.
Try using the u.v. torch and see whether you get a slightly greenish/grey response, or perhaps slightly pink which might indicate it's more modern.
In the mid 1930's, companies like Hill Ouston sourced glasses from Walsh and S&W and produced cut and engraved decoration from earlier styles - just wondering if that sort of thing might be a possibility.
Nonetheless, a great glass for two quid - now where is it that you shop.........
