The image shows an old postcard with a stamp on it, dated 1818-1918, with the text "Zossen, Germany, 1st World War I" written on it.
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The image shows an old postcard with a stamp on it, dated 1818-1918, with the text "Zossen, Germany, 1st World War I" written on it. The postcard is likely a postcard from Germany, as indicated by the text, and the stamp is likely used to indicate that it was issued by the German military during World War II.