Thanks for all that Terry - but, yes, I'm actually very familiar indeed with Boyd's history and marks. In fact I wrote a very full section on Boyd: its history, its products, etc., etc., plus illustrations, in the Contemporary Carnival Glass part of "A Century of Carnival Glass". I communicated with John Boyd in the course of my research and he gave me some very interesting extra material that is in the book.
I only asked you as I simply wondered if you had ruled them out (as of course, they have made some very interesting and unusual colors).
I know now that you have ruled them out :lol: