Hertha restarted at the end of 1945 as SG Gesundbrunnen ( named after a district of northern Berlin ) and resumed play in the Oberliga Berlin - Gruppe C. The thirty-six teams of the first season of the postwar Oberliga Berlin were reduced to just 12 the next year and the club found itself out of first division football and playing in the Amateurliga Berlin . Hertha was re-formed late in 1945 as SG Gesundbrunnen and resumed play in the Oberliga Berlin â `` Gruppe C. The thirty-six teams of the first season of the postwar Oberliga Berlin were reduced to just a dozen the next year and the club found itself out of first division football and playing in the Amateurliga Berlin .