The down side of writing excessively, is that you always get beaten to the 'post' by someone else.
Christine's green tinted glass is a two piece example, presumably, with bowl and stem as one, and the foot as the other.
m's comment quote........ "but I cannot get my head around how you could draw a clear stem from a bowl that has been blown from a uranium glass gather. Would you not have to, in some way, apply a clear blob to draw/apply a clear stem?" .........is rational and proves the point that the Walsh examples are almost certainly three part glasses.
I will leave my scribblings unchanged, and this was what I had intended to post...............
"yes I did go, and pleased to say I have a positive result and will post later this afternoon (I'm fortunate - I can get there in about 40 minutes).
We may be heading towards a non-result on this matter of the knop/collar business, as most probably the clever people who might know the answer are unable to handle the pieces in question.
According to Wilkinson, older drinking glasses were indeed made by a team......i.e. 'servitor' - 'bit gatherer' and finally the 'maker'. This author describes no less than thirteen separate operations, and that was for a simple wine glass (without any knops/collars) - Wilkinson is a good read if you want some detailed descriptions of manufacturing processes. So Lustrousstone would seem to have been correct when speaking of a team.
I could be completely wrong, but had this notion that a drawn trumpet could only be described as such provided there was a continuously smooth (without knops or collars) surface between rim and bottom of stem.
The difficulty, possibly, with these 'Fruiting Vine' glasses concerns the positioning of the knop/collar. If you look at most drinking glasses that possess these decorative components, it is far more common to find such swellings, not at the extreme ends of the stem, but rather at some point along it. With vey rare exceptions (Newcastle Light Balusters) these swellings are formed as an integral part of the stem - presumably by twisting/contracting etc., coupled with use of tools. But the fact that on said glasses the component is bang under the bowl, confuses the issue, although in my ignorance it appears to me that because of the almost split seam between the bowl and the stem, then that implies a join.
Having said all of that, I've never seen a glass being made and can't find a decent book description of manufacture, so finito.