1965-1990 AD., Germany, German Democratic Republic (GDR), Johann Friedrich Böttger commemorative medal, produced by Meissen porcellain factory.

Germany, German Democratic Republic (GDR), Johann Friedrich Böttger commemorative medal, produced by Meissen porcellain factory, ca. 1965-1990 AD.,
Medal (ø 62 mm / 33,27 g), brown porcelain (Böttger-Steinzeug), axis medal alignment ↑↑ (0°), rounded edge,
Obv.: 1682 – 1791 JOHANN FRIEDRICH BÖTTGER · ERFINDER DES PORZELLANS , his bust facing left.
Rev.: 1706 – 1707 / GEFANGENER DER FESTUNG KÖNIGSTEIN , view of the Königstein fortress, crossed swords (Meissen porcellain factory emblem) below.
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Johann Friedrich Böttger (also Böttcher or Böttiger; February 4, 1682 – March 13, 1719) was a German alchemist. He was born in Schleiz and died in Dresden, and is normally credited with being the first European to discover the secret of the creation of hard-paste porcelain in 1708, but it has also been claimed that English manufacturers or Ehrenfried Walther von Tschirnhaus produced porcelain first. Certainly, the Meissen factory, established 1710, was the first to produce porcelain in Europe in large quantities and since the recipe was kept a trade secret by Böttger for his company, experiments continued elsewhere throughout Europe.

Königstein Fortress (German: Festung Königstein), the "Saxon Bastille", is a hilltop fortress near Dresden, in Saxon Switzerland, Germany, above the town of Königstein on the left bank of the River Elbe. It is one of the largest hilltop fortifications in Europe and sits atop the table hill of the same name.
The 9.5 hectare rock plateau rises 240 metres above the Elbe and has over 50 buildings, some over 400 years old, that bear witness to the military and civilian life in the fortress. The rampart run of the fortress is 1,800 metres long with walls up to 42 metres high and steep sandstone faces. In the centre of the site is a 152.5 metre deep well, which is the deepest in Saxony and second deepest well in Europe.
The fortress, which for centuries was used as a state prison, is still intact and is now one of Saxony's foremost tourist attractions, with 700,000 visitors per year.

Meissen porcelain or Meissen china is the first European hard-paste porcelain. It was developed starting in 1708 by Ehrenfried Walther von Tschirnhaus. After his death that October, Johann Friedrich Böttger continued von Tschirnhaus's work and brought porcelain to the market. The production of porcelain at Meissen, near Dresden, started in 1710 and attracted artists and artisans to establish one of the most famous porcelain manufacturers, still in business today as Staatliche Porzellan-Manufaktur Meissen GmbH. Its signature logo, the crossed swords, was introduced in 1720 to protect its production; the mark of the crossed swords is one of the oldest trademarks in existence. It dominated the style of European porcelain until 1756.

More on https://en.wikipedia.org/wiki/Königstein_Fortress , https://en.wikipedia.org/wiki/Johann_Friedrich_Böttger ; https://en.wikipedia.org/wiki/Meissen_porcelain , https://de.wikipedia.org/wiki/Meißner_Porzellan