Beyermann&Company was a glass refinery in Haida 1865-1928. Or perhaps longer. I have searched and collected information about them, and my first vase, since 2016. Much together with a glass friend of mine, Helena Ciompová. Now she has written an article about them for the Magazine Sklář a keramik. It can also be found online at https://www.sklarakeramik.cz/aktualni-cislo/