Competitive saber fencing meant Italian-style fencing even in Germany…Practicing under the towering horse chestnut trees that often surrounded schoolyards and barracks in 19th- and early 20th-century, these fencers have a distinct military bearing—as became any German man with higher aspirations in the Wilhelmian Age. This photo was taken by a Dresden photo studio, propbably around 1910.
Hans Kufahl, in his 1908 Der Fechtsport, lists the Dresdener Fechtklub as the only establishment of the kind in the city. The club’s fencing master, according to Kufahl, was “G. Casmir”. Gustav Casmir (born November 5, 1874, died October 2, 1910) is closer associated with the Berliner Fechtclub. He also was Olympic gold medalist in the individual and team saber events in Athens in 1906—and the uncle or German champion Erwin Casmir.
There is no indication that would help identify the gray-haired man on the right as G. Casmir.