If their attributions on English glass are as much fantasy as most of their Bohemian ID's, the chance of it being Webb are very very slim. I am familiar with this seller, and their general knowledge of glass is far less than their extensive knowledge of inaccurate keywords to draw lookers. In many cases accuracy does not seem to be a great concern to them when it comes to glass.....
The quality of the work on the piece does not strike me as Webb Cameo at all.....
Craig