1971 AD., Germany, German Democratic Republic (GDR), Staatsbank der DDR, Berlin, 10 Mark, Pick 28a. UB 548852 Obverse

State: Germany, German Democratic Republic (GDR)
Issuer: Staatsbank der DDR
Location of issue:
Date of issue: 1971 AD., in circulation since March 1975 (Act 06.02.1975)
Value: 10 Mark der DDR
Size: 120 x 53 mm
Material: paper
Watermark: bust of Clara Zetkin half left
Serial : UB
Serial no. : 548852 (6 digits wide serial #)
Signature: - (0)
Printer:
Obv.: / / / …. , bust of Clara Zetkin half left.
Rev.: / / / …. , Female engineer sitting at a control console inside the Rheinsberg Nuclear Power Plant.
References: World Paper Money P-28a .

Clara Zetkin (née Eißner ; 5 July 1857 – 20 June 1933) was a German Marxist theorist, activist, and advocate for women's rights.
Until 1917, she was active in the Social Democratic Party of Germany. She then joined the Independent Social Democratic Party of Germany (USPD) and its far-left wing, the Spartacist League. This later became the Communist Party of Germany (KPD), which she represented in the Reichstag during the Weimar Republic from 1920 to 1933. When Adolf Hitler and his Nazi Party took over power, the Communist Party of Germany was banned, following the Reichstag fire in 1933. Zetkin went into exile for the last time, this time to the Soviet Union. She died there, at Arkhangelskoye, near Moscow, in 1933, aged nearly 76. After 1949, Zetkin became a much-celebrated heroine in the German Democratic Republic (East Germany), and every major city had a street named after her. Her name can still be found on the maps of the former lands of the GDR.

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