~ Sitz' nicht beim Biere alle Zeit ~
 
This sounds like the Boy Scout's motto "Be Prepared", but for beer drinkers. The light relief stein is marked with the Reinhold Merkelbach logo and "660 D", ca. 1900.
 
Sitz' nicht beim Biere alle Zeit,
auch zu Thaten sei bereit.
Don't sit with a beer all the time,
also be prepared to drink one.
 
 
Translation: Roy De Selms
Photo credit: Unknown