The photos submitted by Ray show a 3-part glass, comprising bowl, stem and foot. The stem is round. and as Frank states by his identification of the box, one of the early productions. Later Ravenhead developed a cheaper version via their automatic machine line at St Helens, these had a 6-sided stem. Showerings switched their contract(s) to Ravenhead to save costs.
When I was researching for my book on Nazeing I was told that the Company produced the glasses (with the round stems) and also decorated them. Since then, I have heard of the invovlement of Moncrief/Ysalt for the decoration so now I wonder if Nazeing only made the glasses and then shipped them to Scotland for the decoration. Unfortunately as Frank has told us, Showerings (or their successors) do not have any information to help.