yes you're both right :ooh:
Frank, I'm on the case. I'm about to send pictures to someone who should be able to help a little more hopefully although I don't know how long it will be before I hear back. If they can, I'll come back when I have further information.
I've compared the goblet base to the two in the book and they are comparable in terms of what they look like, apparently on size although that is difficult to know given the bowl of the goblet seems to be missing, and also on how they have been constructed. So they could be bases to S & W goblets, although there may be other makers out there who constructed goblets in the same way and made a similar piece I guess. The detail on the horse one in particular is also comparable to the one in the book. But again as you say, it could have been made by anyone else. The book says there were sets of these glasses made called 'The Kill' and 'Full Cry' depicting scenes of the hunt. I presume there is some documented evidence of these somewhere, so hopefully I will get some evidence which could help.