Sender: The sender's location is indicated by the postmark "BEX (VAUD)" and the message origin "Bex, den 30. August 43". Bex is a municipality in the canton of Vaud, Switzerland.
Verification: Bex, Vaud, Switzerland existed in 1943 and continues to exist today. Google Maps confirms its location. The "PRO INFIRMIS" organization and the card publisher (Edition A. Müller, Lausanne / Artist A. H. Daepp, Chexbres) are also plausibly Swiss entities from the period.
Recipient: Frau Dr. Benischek, Kirchelweg 7, Ulm a/D, Württemberg.
Verification: Ulm is a city in Germany, located on the Danube river (a/D = an der Donau). In 1943, it was part of the state of Württemberg. Google Maps confirms the existence of Ulm and a street named "Kirchelweg" within the city. The address format and location are plausible for Germany in 1943 during WWII. The presence of the German military censorship stamp ("Geprüft / Oberkommando der Wehrmacht") further supports mail delivery into Germany at this time.
Origin: Bex, Vaud, Switzerland
Destination: Ulm, Württemberg (now Baden-Württemberg), Germany
Distance: The approximate distance between Bex, Switzerland and Ulm, Germany is around 385 kilometers (approx. 240 miles) via modern road networks (estimated using Google Maps).