hi David, thanks for the comments.
As you will know better than me, T/Webb material is often without any backstamp - it's a good job that a lot of their glass is recognizable

Thanks for the link to your GlassEye site, and I'd agree that this c. 1935 - 49 circular acid stamp with 'Made In Webb England' is one of the commonest that we see, and perhaps I was being a little nit-picking re my comments about this particular mark looking different in size and style to others from this period.
I'm still of the opinion that this mark is a tad smaller than the others, but what is most noticeable is the appearance of the letters themselves. I've looked at several other backstamps from this period/factory, from my own collection, and they look identical to the example in your link i.e. solid letters.
However, the individual letters on this one are shown in outline only - they are not solid letters - and it was this difference that caught my eye. I've attached a clearer picture of this backstamp which I hope shows this feature. Do you have any examples like this??
Finally, and on the subject of less than common colours.............attached is a pic of my only other piece of blue T/Webb (with the circular backstamp for the above date line) - and the pic shows what is possibly an even less common colour..........genuine lime. Most definitely doesn't fluoresce (I've used the torch) - and this again has the same backstamp. I'd assume cocktail glasses, and they're about 3" tall.
Unfortunately, I've really no idea what the surface texture pattern might be called.
So, what can you tell me about lime David.
