I've looked on the Board's archive but it didn't come up when I searched using the name and Rd. number, so hope I haven't missed it somewhere.
It's a late design in the list of lozenge Registrations, and would appear from the attached picture from TNA at Kew that it was simply the shape that was being protected - just a plain outline without any decoration - the trade mark is just about visible at about two o'clock in the first picture.
You can see where W/Fs got the 'cog wheel' idea from
In case the lozenge details aren't too clear, clockwise starting with the top they read …...…….. 19 - E - W - 11.
It's quite small - Simon Cottle calls it a 'Sweetmeat' - size is something like 5" (127 mm) in diameter and 1.75" high (45 mm) - no idea if this one was ever produced in marbled or other colours. Unfortunately, just realized that when taking the picture I've cropped the bottom excessively, and can see I chopped off the text description, so must assume Cottle was correct.
Apologies if we have had this previously.
Ref. 'Sowerby - Gateshead Glass' - 1986 - A Tyne and Wear Museums Service publication edited by Simon Cottle.