just as a matter of interest .........Ruth A. Forsythe ("Made in Czechoslovakia") - shows a single tumbler in the same design/pattern as Craig's - which she describes as '5" tumbler. green overlay, blue threading' (page 57) - although she doesn't attribute the piece to any particular factory. Also on the same page are a couple of vases that, whilst nowhere near as stunning as Jindrich's, do show the same direction of pattern with this red trailing coming up in thread like form. There are other pieces in the book that show this very attractive pulled colouring - and I suspect one or two pieces in U. glass - although presumably Forsythe didn't have access to a uv torch in 1982.
I shall be envious of whoever gets the red/uranium tumblers, they are stunning.