Signature denoting Gebrüder Bergmann, Munich on the featured stein. In old German handwriting, e.g. Kurrentschrift, the macron (dash) over the "n" in the above signature, translates as "nn" in modern text; hence "Bergmann". 
Partial image of a Red Cross Occupational Stein. Sold by Gebrüder Bergmann. Circa 1900-1910 
Artist's signature on the base of the featured Gebrüder Bergmann stein. 