FREDERICK THE GREAT FREDERICK II; KING OF PRUSSIA (1712-1786) Letter Signed, "Friedrich," as King, to the President of the Regency of Cleves Baron von Danckelmann, in German, granting him permission to visit Berlin. 1 page, 4to, with integral blank; mounted at corners and along one edge of blank to larger sheet, folds, faint soiling at edges. With address panel and remnants of wax seal removed from the original envelope, both mounted to a sheet. Berlin, 28 December 1764. Estimate $400 - 600 "I received your letter of the 22nd of this month, and I allow that, if you first take the necessary measures so that nothing is neglected with respect to your function, you may then come to Berlin for two months to arrange your family affairs." with--early engraved portrait of King Frederick.