~ A' frische Mass ~
"Mass" is the term used for an approximate 1 liter (of beer). The Jugendstil (youth style = modern art) stein is marked with the logos of Bruno Mauder and Merkelbach & Wick, ca. early 1900's. See: Chris Wheeler's "Stein Marks" website for more info on both this decorator and factory.
A' frische Mass! A fresh measure (of beer)!
Translation: Roy De Selms
Photo credit: Unknown