1986 AD., Germany, German Democratic Republic, 200th anniversary death of Frederick the Great commemorative, Berlin mint, 5 Mark, KM 110.

Germany, German Democratic Republic (DDR or GDR), 200th anniversary death of Frederick the Great commemorative, engraver: Heinz Rodewald, Berlin mint, 1986 AD.,
5 Mark (ø 29 mm / 9,51 g), copper-nickel-zinc (0.62 Cu, 0.18 NI, 0.20 Zn), 9,60 g. theor. mint weight, mintage 295.340 , axis medal alignment ↑↑ (0°), plain edge with incuse inscription “5 MARK * 5 MARK * 5 MARK * 5 MARK * “,
Obv.: DEUTSCHE DEMOKRATISCHE REPUBLIK / A / 1986 5 MARK , hammer and compass emblem of the German Democratic Republic at center, Berlin mint mark (A) above, date and value below.
Rev.: SANSSOUCI / POSTDAM / R , Sanssouci Palace of Potsdam, the summer quarters of Frederick the Great, engraver´s initial below.
KM 110 .

Year / Mint Mark / Mintage
1986 A 295.340
1986 A 4.200 (proof issue)

Frederick II (German: Friedrich; 24 January 1712 – 17 August 1786) was King of Prussia from 1740 until 1786, the longest reign of any Hohenzollern king. His most significant accomplishments during his reign included his military victories, his reorganization of Prussian armies, his patronage of the arts and the Enlightenment in Prussia, and his final success against great odds in the Seven Years' War. Frederick was the last titled King in Prussia and declared himself King of Prussia after achieving full sovereignty for all historical Prussian lands. Prussia had greatly increased its territories and became a leading military power in Europe under his rule. He became known as Frederick the Great (Friedrich der Große) and was affectionately nicknamed Der Alte Fritz ("Old Fritz") by the Prussian and later by all German people.
More on https://en.wikipedia.org/wiki/Frederick_the_Great

Sanssouci is the summer palace of Frederick the Great, King of Prussia, in Potsdam, near Berlin. It is often counted among the German rivals of Versailles. While Sanssouci is in the more intimate Rococo style and is far smaller than its French Baroque counterpart, it too is notable for the numerous temples and follies in the park. The palace was designed/built by Georg Wenzeslaus von Knobelsdorff between 1745 and 1747 to fulfill King Frederick's need for a private residence where he could relax away from the pomp and ceremony of the Berlin court. The palace's name emphasises this; it is a French phrase (sans souci), which translates as "without concerns", meaning "without worries" or "carefree", symbolising that the palace was a place for relaxation rather than a seat of power. The name in past times reflected a play on words, with the insertion of a comma visible between the words Sans and Souci, viz. Sans, Souci. Kittsteiner theorizes that this could be a philosophical play on words, meaning "without, beware" or it could be some secret religious message which nobody has interpreted, left to posterity by Frederick II.
More on https://en.wikipedia.org/wiki/Sanssouci