• The Stamps: It features two classic Austro-Hungarian Empire stamps—the red 10 Heller Imperial Crown definitive and the green 20 Heller Emperor Franz Joseph I profile stamp.

• Red Cross Connection: It is addressed directly to the "Villa croix rouge, Suisse" (Red Cross Villa) in Lausanne. During WWI, Switzerland served as the central hub for the Red Cross to process mail, trace missing soldiers, and handle communications between families separated by the war.

• Swiss Customs Tag: The red label affixed to the bottom left is a Swiss Customs marker from the Lausanne train station post office ("Douanes suisses / Bureau de Lausanne-gare"), marking it as exempt from import duties ("Exempt de droits d'entrée"

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• The Origin Stamp: The oval stamp in the top left indicates it was sent by R. Pfenninger, a wood pulp and cardboard manufacturer ("Holzstoff- & Pappendeckel Fabrik") based in Jenbach, Tirol (Austria