Thanks for the link to this thread.
In my opinion the posy bowl shown here is in the catagory of unknown (see thread "Is it Clutha Glass", for other readers), since the shape is not that of Nazeing's Posy Bowl as shown in the catalogue pages in Timberlake.
Those catalogue pages only show a view of the top of the posy bowls and not their profiles. All the examples of known and documentable Nazeing, including shape, colour and finish, that I'm aware of do not have this cylinderical form to the base. Additionally the rim should be wider in proportion to the base.
What this proves is that Elwell were selling, and therefore buying this type of glass. It takes us a step closer to finding out about these pieces, but it does not prove them to be Nazeing just because it has an Elwell label and has a similar look. Having said that, how do we know that it isn't the 'Elwell range' with the snapped off pontil's, referred to in 'Timberlake', and that I refer to in the other thread?
The answer is that we don't. To my mind this is a very useful piece of a jigsaw puzzle, but it does not answer the question catagoically.
Kind regards, Nigel