The Niemen glassworks was in Brzozówce near Nowogródek, was in the Second Polish Republic, but after 1939 was in the Byelorussian SSR (now Belarus).
Until 1939, it was the most famous Polish glass and artistic glassworks - at that time it operated under the name Huty Szklane Juliusza Stolle Niemen SA. In the interwar period, the Niemen glassworks was the largest Polish producer and exporter of pressed and blown glass to European countries (including the Netherlands, France), North America (Canada), South America (Argentina), Africa and the Middle East (m.in. Palestine, Syria ). In the foreign trade of the Polish glass industry, the share of the plant was: in 1930, 21%, 1931 - 20%, 1932 - 19.7%, while the monopoly on glass accessories was maintained. At that time, employment was close to 750 people. Before the Great War the Niemen catalogue contained 2,000 items.
In the 1930s, Niemen glassworks produced over a third of the decorative and utility glass available on the Polish market, (including Gallé lamps intended for gifts for President Ignacy Mościcki, tableware for the President's residence at Wawel, in Warsaw and Grodno, and a three-piece urn for the heart of Marshal Józef Piłsudski, made in 1935). Niemen very rarely signed his products. Attribution is possible from the four-part catalogue which was successively published in the 1930s. It does not include designs from the years 1937-1939 and designs intended solely for export.
Credits: Basic information https://pl.wikipedia.org/wiki/Huta_Szkła_„Niemen”
Further Information: Ziemia Lidzka (English translation)