Looming 118 meters above the Rhine, the massive Prussian fortress of Ehrenbreitstein glowers across the river toward Koblenz in this moody early-20th-century real-photo-style card — a long pontoon pier in the foreground giving a sense of the vast scale of this storied strategic stronghold. What makes this card truly exceptional is its reverse: sent home in May 1919 by an American soldier identified only as "K.K." from P.O. 792, Co. 2, 55th T.B., 5th C., it bears a bold purple circular A.E.F. Passed as Censored stamp — a vivid artifact of the American Expeditionary Forces' post-Armistice occupation of the Rhineland. K.K. wrote to a woman named Harald back in Waterbury, Connecticut, hoping to be home "before long," a poignant note of longing from a soldier waiting out the peace.