1987 AD., Germany, German Democratic Republic, 750th anniversary of Berlin – Nikolaiviertel commemorative, Berlin mint, 5 Mark, KM 114.

Germany, German Democratic Republic (DDR or GDR), 750th anniversary of Berlin – Nikolaiviertel commemorative, engravers: Joachim Rieß and Volker Beier, Berlin mint, 1987 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 492.606 , axis medal alignment ↑↑ (0°), plain edge with incuse inscription “5 MARK * 5 MARK * 5 MARK * 5 MARK * “,
Obv.: DEUTSCHE DEMOKRATISCHE REPUBLIK / A / 1987 5 MARK , hammer and compass emblem of the German Democratic Republic at center, Berlin mint mark (A) above, date and value below.
Rev.: NIKOLAI – VIERTEL / BERLIN , view of the Nikolai district, Berlin.
KM 114 .

Year / Mint Mark / Mintage
1987 A 492.606
1987 A 4.200 (proof issue)

Founded about 1200, the Nikolaiviertel (Nicholas' Quarter) of Alt-Berlin, together with the neighbouring settlement of Cölln, is the reconstructed historical heart of the German capital Berlin. It is located in Mitte locality (in the homonymous district), five minutes away from Alexanderplatz. Situated on the eastern shore of the river Spree, it is bounded by the streets Rathausstraße, Spandauer Straße and Mühlendamm. The deconsecrated Nikolaikirche (Saint Nicholas Church), Berlin's oldest church, gives its name to the neighbourhood and lies at its centre.

More on https://en.wikipedia.org/wiki/Nikolaiviertel