1959 AD. and later, Germany, German Democratic Republic, Annaberg-Buchholz tourist medal on the 400th death-anniversary of mathematician Adam Ries, bronze.

Germany, German Democratic Republic (DDR or GDR), Annaberg-Buchholz tourist medal on the 400th death-anniversary of mathematician Adam Ries, 1959 AD. and later,
Medal (ø 31 mm / 12,85 g), bronze, axis medal alignment ↑↑ (0°), plain edge,
Obv.: ANNO 1650 ADAM RIES SEINS ALTERS IM LVIII / 1492 - 1559 , bust of Adam Ries facing, in his 58th year of age, his only contemporary portrait.
Rev.: ANNABERG – BUCHHOLZ / ERZGEBIRGE // A R / 4 / 2 – 2 / 4 , his shield of arms with calculation formula 2 x 2 = 4.
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Adam Ries (January 17, 1492 – March 30, 1559) was a German mathematician. He is also known by the name Adam Riese.Adam Ries (January 17, 1492 – March 30, 1559) was a German mathematician. He is also known by the name Adam Riese and became very popular in Germany because he was the first who wrote his mathematical texts in German. Annaberg-Buchholz is a town in the Free State of Saxony, Germany. Lying in the Ore Mountains, it is the capital of the district of Erzgebirgskreis.
More on https://en.wikipedia.org/wiki/Adam_Ries ; https://en.wikipedia.org/wiki/Annaberg-Buchholz

Diese Adam-Ries-Medaille wurde 1959 in Annaberg-Buchholz erstmals in Kupfer oder Tombak geprägt.
Bis heute ist sie bei der Touristeninformation in Alu, eloxiert für einen Euro kaufbar.