1920 AD., Germany, Weimar Republic, Erfurt (city), Notgeld, collector series issue, 20 Pfennig, Grabowski/Mehl 344.6-2/3. 518322 Reverse

State: Germany, Weimar Republic
Issuer: Erfurt (city) (PrS / Th) Stadt
Location of issue: Erfurt (city)
Date of issue: 9.4.1920 AD.,
Value: 20 Pfennig
Size: 85 x 65 mm
Material: paper
Watermark: -
Serial : -
Serial no. : 518322 ( 6 digits )
Signatures: (2)
Printer: Otto Richters & Co., Erfurt , designer Alfred Hanf
Obv.: / / / …. , Erfurt street views flanking text, serial and signatures below.
Rev.: / / / …. , Collegium Maius of the old univesity and Michaelis church, arms six-spoked wheels flanking.
References: Grabowski/Mehl 344.6-2/3 .

Erfurt is the capital and largest city in the state of Thuringia, central Germany. It is located in the southern part of the Thuringian Basin, within the wide valley of the Gera river. It is located 100 km (62 mi) south-west of Leipzig, 300 km (186 mi) south-west of Berlin, 400 km (249 mi) north of Munich and 250 km (155 mi) north-east of Frankfurt. Together with a string of neighbouring cities Gotha, Weimar, Jena and others, Erfurt forms the central metropolitan corridor of Thuringia called Thüringer Städtekette (German "Thuringian city chain") with over 500,000 inhabitants.
Erfurt's old town is one of the best preserved medieval city centres in Germany.
Erfurt was first mentioned in 742, as Saint Boniface founded the diocese. Although the town did not belong to any of the Thuringian states politically, it quickly became the economic centre of the region and it was a member of the Hanseatic League. It was part of the Electorate of Mainz during the Holy Roman Empire, and later became part of the Kingdom of Prussia in 1802. From 1949 until 1990 Erfurt was part of the German Democratic Republic (East Germany).
The University of Erfurt was founded in 1379, making it the first university to be established within the geographic area which constitutes modern-day Germany. It closed in 1816 and was re-established in 1994, with the main modern campus on what was a teachers' training college. Martin Luther (1483–1546) was its most famous student, studying there from 1501 before entering St Augustine's Monastery in 1505. Other noted Erfurters include the medieval philosopher and mystic Meister Eckhart (c. 1260–1328), the Baroque composer Johann Pachelbel (1653–1706) and the sociologist Max Weber (1864–1920).
More on https://en.wikipedia.org/wiki/Erfurt

Das Collegium Maius war das Hauptgebäude der Alten Universität in Erfurt, die von 1392 bis 1816 bestand. Ein ab 1998 im alten Stil errichteter Neubau befindet sich nach Zerstörung des Altbaues im Jahre 1945 in der Michaelisstraße im Zentrum der Erfurter Altstadt, im sogenannten „Lateinischen Viertel“. Im alten Gebäude befanden sich das Rektorat, Hörsäle und der Große Festsaal der Universität. Im Jahr 2011 zog das Landeskirchenamt der 2009 durch Fusion entstandenen Evangelischen Kirche in Mitteldeutschland in das neue Collegium Maius ein.
Die Michaeliskirche in Erfurt gehört zur Evangelischen Stadtmission Erfurt und ist Universitätskirche der Universität Erfurt. Seit 1392 war die Michaeliskirche die Universitätskirche der Universität Erfurt. Die Lehrgebäude der Universität lagen ihr direkt gegenüber, darunter später das Collegium Maius.
More on https://de.wikipedia.org/Collegium_Maius_(Erfurt) ; https://de.wikipedia.org/wiki/Michaeliskirche_(Erfurt)