King of Prussia known as the 'Soldier King' (1688-1740) who did much to improve Prussia economically and militarily; father of Frederick the Great. LS in German, one page, 7.5 x 9.5, March 14, 1724. Untranslated letter from Potsdam, signed at the conclusion by King Frederick William I of Prussia. In very good to fine condition, with blocks of toning to borders. Accompanied by an engraved portrait.
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