Hello,
Out of hibernation - well actually back from a prolonged stay down at Mum's. Kept thinking I'd get away only to delay another day, and another, and anoth..... well, you get the picture.
I have looked this up in the catalogues I have and found two similar items that conform with the suggestion of Webb Corbett. However, both vases, pattern nos 405 (shown on page 29, item 153 of "Art Deco to Post-Modernism" catalogue) and 481 were available as 9" or 11"; both are the same shape and have the scalloped rim; 405 also has the same horizontal mitre cut band just below the rim.
Certainly not David Queensberry, but don't forget Len Green and David Smith also produced designs for WC post war. Len Green's work is, on the whole a tad pedestrian and traditional. Whilst both he and Smith worked with Irene Stevens, Smith's experimental work with Stevens gave him an insight into design that Green, perhaps, lacked. That said all three were obliged by the management to produce designs that were traditional, which was the bulk of the companies production - just as with other cut glass producers. The quality and scarcity of these items is why I believe these Art Cut pieces are so important as a collecting area.
Sorry, not conclusive, but it may suggest WC is the right area to research further.
Nigel