I've just had to take a good look at an historical atlas, in order to place these different regions of pre First World War Bohemia, Germany, Poland, etc.!
What interests me greatly is why the weight in the Pwt. Circle 1999 Exhibition was attributed to Thuringia, thus potentially leading on to an attribution for mine. Was it the colour and quality of the glass? is the design a known variety? or are there details of technique that are common to weights of this origin? What, please, are the clues?
Also why Thuringia in particular, rather than Bohemia or Silesia?