... Correctly, the date should read.........'1935 - 49'. ...
Paul — I don't know whether you picked this up from BGbtW or elsewhere, but as BGbtW is the earliest I can find, I will assume that this date range originates from BGbtW.
Roger Dodsworth wrote Appendix III, Marks, and made a pretty good job of it, considering that a museum collection has little in common with general production, concentrating, as you would expect, on special and exceptional pieces. He recognised that and liberally sprinkled his dates with "c."s for circa to show that his dates were only approximations. Somewhere along the line your date range, Paul, has lost its "c.". So, unless there has been a fresh appraisal of Webb's marks, your date range should read:
c. 1935–49
It is worth noting that Roger missed a few contemporary marks like the Richardson mark with a central Union Jack, and the Stuart/Stonier mark of an "S" over a Plimsoll Line. Also the section on Webb Corbett marks needs substantial revision.
... You need an expert, and we need Nigel Benson, Christine, or Bernard to comment ...
Please don't include me into any list of experts or authorities — it's unwarranted and could be misleading to new members. I know my way around most of the books on British glass, and I've handled a fair amount of low- to medium-priced stock, the same as many other members, but that's all.
Bernard C.