What lovely glass β I am most envious.
This style is very difficult to attribute accurately. Narrowing it down a little, I understand that the style was not made by Powell / Whitefriars, so it is reasonable to describe it as "Stourbridge", if, like Hajdamach, you include Walsh and Smart Brothers, both only a few miles from Stourbridge, in that classification.
Hadjamach had great difficulty finding fully attributable examples, only showing examples by Stuart and S&W, including a further example decorated with S&W's Mat-Su-No-Ke flowers. Reynolds has published a photograph of a Walsh example in his collection, marked with Rd. No. 74556 (see also p22 of the Thompson supplement, bound in with the main volume in recent printings). Apart from these no other published example (print or Internet) known to me has included any reasonable explanation of the basis of attribution, and that includes the example attributed to S&W on the back cover of Newby, my only criticism of this otherwise excellent book, although I believe this particular attribution to be correct because of the similarity of the flower with the marked example in Hajdamach.
Further evidence of confusion is that such unsubstantiated attributions tend to vary according to whether the item is in the USA or Britain, with the authorities in the two countries having their own particular favourites.
Like Leni, above, I understand that these styles were also made elsewhere in Europe.