
Given it is pressed glass, moulds must have been made to create it. Moulds are expensive to produce.
When a piece of pressed glass turns up we can't identify and have seen few examples of previously, you start to suspect it might be of Bohemian origins. They had the big factories which were able to make loads of different moulds, as there were not the same restrictions on finances on their side of the Iron Curtain. The arts and culture were more strongly supported.