This mark signifies their role as appointed jewelers to the Imperial German Court. • Maker: Gebrüder Friedländer, Berlin, Germany. A rare and historically significant set of three antique gentleman's shirt/tuxedo studs by the prestigious Gebrüder Friedländer, the official court jewelers to His Majesty the German Emperor and King of Prussia during the reign of Kaiser Wilhelm II (circa 1890–1914).