~ Heil und Sieg ~
Although the banner on this stein represents the German State Flag in use from 1949-1959, it was also used as the German National Flag from 1919-1933. This stein can be dated to having been made during the 1919-1933 period and might have been bought by someone in a militarized, political group called the Reichsbanner (Government Flag) or Schwarz-Rot-Gold (black-red-gold) which was formed in 1924 during the Weimar Republic for the purpose of defending the parliamentary democracy and continued later in the anti-Nazi resistance.
Heil und Sieg! Prosperity and victory!
Translation: Roy De Selms
Photo credit: Unknown