Extremely rare so-called "speaking Feldpost letter". The Red Cross provided a special service for wounded soldiers in military hospitals who have lost their arms to stay in contact with their family. They had to chance to send a record home. This one was sent from Feldwebel Zirngibl from the Luftwaffe-Lazarett Wien XIX Abteilung III. He sent it to his wife in Nürnberg. It is 17.4.1943 dated and still comes in the original folder they sent it in. The disk looks to be in very good condition.
Diameter of the disc: 20cm. Size of the folder: 26cm + 23cm.
