To clarify a earlier statement, it is not possible to separate Lusatia from Silesia. Beyond that, this is the story of Spezialglashüttenwerke Gebrüder Funk & Co as far as I have been able to put together so far. Any corrections or contributions are gladly accepted, and of course, I would still love to see more pictures of their products.
Penzig (now Piensk, Poland), located on the east side of the Lusatian Neisse River, by the mid-1850s was settled mostly by ethnic Germans. The first glass house was built there around that time and over the years Penzig developed into a regional center for the glass industry. In the early part of the 20th Century there were at least a half dozen large glass works in the town when, in 1914, Kurt and Max Funk, along with business partners Rudolf Baldermann and Otto Heidenreich, started their business. Gebrüder Funk & Co. is described as making lighting glass, vases, and "specialties in all colors". They chose a location away from the industrial area out on DeschkaerStrasse (now Luzyka Street). Later that same year, Germany declared war on Russia.
There was some fighting nearby to the north but Penzig and its glass industry survived unharmed. As the dust settled, the industry prospered. In 1925, Gebrüder Funk employed 100 workers blowing, grinding, and "blasting"(?) products. By 1935 they employed 150. In 1939, Germany invaded Poland.
After nearly six more years of war. this time when the dust cleared there was little left of Penzig or its industries. Some reports say the glass houses and other industries were stripped of all usable items by their owners and evacuated into Germany ahead of the Russian Army's arrival. Bombing by the British and shelling by the Russians destroyed most of what was left of the downtown and industrial zone. Even the somewhat isolated location of Gebrüder Funk & Co. was no protection from destruction. By treaty at the end of WWII, land east of the Neisse River changed from Germany to Poland. Shortly thereafter Penzig became Piensk. Gebrüder Funk & Co. did not return.