Says "Berliner Bock Brauerei" and spins to show numbers from 0 to 12.... I was told it was to keep track of how many beers you had drunk!!! Heraldic Neoclassical imagery on each side of the coin-shaped disc. Inner wheel is white metal, outer is a copper/bronze type. 1" diameter. The Hopf'sche Berliner Bock-Brauerei was a historic brewery founded in 1838 in Berlin-Kreuzberg, Germany. It was the city's first facility dedicated to brewing strong Bock beer. The brewery expanded in 1868–1869, ceased brewing operations in 1922. So this is c. 1870 - 1900, I imagine.