Hi Amarine, your collection is so beautiful and delicate......and I have been entranced by your Grandfather's amazing woodcut of glassblowers......I collect glass pieces depicting glassblowers............just missed one last night
We had some glass plates here on the GMB that had very similar styles of engravings to your Grandfathers woodcut, and I wonder if anyone here on the GMB can remember who posted it and if they were Hadeland pieces.
I have a full day today, but if no one comes up with an answer, I will have a look this evening and see if I can find the link and see if there is a correlation.
Do you have any Hadeland glass animals or birds at all?