My email to Kerry Crafted Glass resulted in the following information (my paraphrasing):
- the original Kerry Glass (which had opened in 1977)... closed in 1996
- it had ceased ties with IOW around 1982/3
- Kerry Crafted Glass was opened in 1998
So, this makes sense of the information in the Kerry Crafted Glass website where it just states that Kerry Glass "closed 2 years ago".
I don't know whether the break with IOW in 82/3 is confirmed by Mark's book (sorry, Mark, but I don't have a copy) or if it has any bearing on the use of the seal on Kerry Glass.