it's attractive and I'm a big fan of art nouveau - although regret to say I'm unable to help in any way regarding origin or attribution, but just wanted to comment that we don't discuss values on the GMB.
You may find this surprising, as most States based appraisal and information sites, plus many books such as the Schiffer publications for example, routinely provide some guide to current values.
Those people who collect glass, differ enormously in their subject interest, and whilst Carnival glass for example may interest many, it may do nothing for others - the consequence of which is that personal ideas as to value, will vary equally widely.
There is also the real possibility that if values were provided, and a piece of glass was sold without its realized price matching what might have been discussed, then disappointment might cause repercussions here.
Although you should hopefully be able to discover the maker of the metalwork, there's no guarantee that you will locate an attribution for the glass.
Some direct comparisons of values of similar pieces can be found searching on-line auctions houses, together with the relevant value, which will help - although obviously this isn't always possible. Discussing an item with an auction house or acknowledged glass expert should provide help in virtually all other instances, and wish you luck.
