“Borussia Glas” Probobly by Carl Schappel, this vase is of the Haida school and made by Joh. Oertel & Co. around 1912.
Colorless glass, overlaid with opaque white and black and then cut.
Published in the magazine Die Kunst vol. 28 1912-1913. Similar vase also seen Glass 1905-1925 Neuwirth p. 268.