There is evidence that more than one manufacturer produced this pattern and Andy McConnell in his excellent book, Millers 20th Century Glass, points out that even Ronald Stennett Willson of Kings Lynn Glass and Wedgwood Glass fame commissioned, or attempted to commission, a Scandinavian company to produce the design while he was at Wuidart in the 1960s. It was certainly produced in Bohemia (now the Czech Republic) and it is not uncommon to find etched latticework Pall Mall glass with a "Made in Bohemia" sticker. There is also evidence that the pattern was manufactured in Belgium.
Later still are the balustroid glasses that bear the same Pall Mall Lady Hamilton pattern design but which bear no resemblance to the form of the original glassware. These were made in Bohemia in the late 20th century and sold as "The Lady Hamilton Collection". They can sometimes be found in the original boxes that bear UTC-A bar codes which only came into common use in the late 1970s.