Lt. Work & Prince Christian - Glass negative photogrpah. Public domain.

Photo shows Prince Christian von Hessen-Philippsthal-Barchfeld (1887-1971) of Germany with Lieutenant Work. Probably relates to the visit of German naval ships to New York City in June, 1912. Prince Christian was a Lieutenant Commander on the Stettin, one of the visiting ships. (Source: Flickr Commons project, 2009 and the New York Times, June 5, 1912)