And Sowerby it is. The full label reads "Sowerby's Tyneside Glassware". This is a #2602 Rose Bowl and Block, 5 1/2", listed in my catalogue as available in flint, amber, blue and green. You'll have to wait for someone else to confirm the dates - I can't find Glen's CD, so I'm working from old photocopies of illustrated list no. 39 (which someone has pencilled in was from 1950, but I can't be sure).
Mark & Cathy β it isn't 2602. It's definitely Sowerby, and it's definitely what they called a
Rose Bowl and Block, but you will have to find another pattern number, probably from Glen's CDs. 2602 has a pronounced shoulder leading up to the flower block, decorated with bars set at an angle. It also has wonderfully eclectic legs, shown in the catalogue as fitting over a raised central area on a special reversed plinth, with a note that it also fits the much more catholic 2506 plinth, which is how most of those I've bought have been plinthed.
Here is previous mention on the GMB of the Sowerby 2602. Note that Jobling also used 2602 for one of their bird bowls.
... and a plea. I would welcome accurate measurements of one of these special 2602 reversed plinths, together with its number (if marked β it should be 2602 or 2603, but it could be another number), and a description of the punch font. Photographs would be a lovely bonus.
Bernard C.