This postcard has been autographed by Prinz Oskar von Preußen. He was one of Kaiser Wilhelm II’s six sons. The postcard shows a stallion in profile. It has the Prinz’s signature, and is dated 1904. It is dedicated on the reverse to a Gräfin von Rantzau, who was a good friend of Oskar’s mother, Kaiserin Augusta Viktoria. The dedication has been obscured on the reverse, but the black ink signature of the young Prinz is very clear.
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FOR MORE INFORMATION ON PRINCE OSKAR: https://en.wikipedia.org/wiki/Prince_Oskar_of_Prussia