I came across the Classroom Chair at a Phillips de Pury auction earlier.
Now NYC based J. Lohman Gallery has one for sale.
According to Lohman:
Stefan Wewerka
Vertreterstuhl or Klassenraumstuhlâ (Classroom Chair)
Germany, c. 1970
Lacquered wood
C. 30 ¾ in. (78 cm) high, 26 in. (66 cm) wide
Originally called the Vertreterstuhl, the chairs were part of an installation of a classroom at Galerie Moeller in Cologne in 1971. Since then the chair is also called Classroom Chair. Literature: Take a seat: Meisterwerke des Stuhldesigns (Masterpieces of Chair Design), Chart Gallery, Basel, 2005, pp. 102-103.Object No.: 8005
Price on request.
Lohman specializes in European design and decorative arts from the 1920s -1980s from mainly German designers and artistic movements.
A “Vertreterstuhl” is an Sales Rep Chair in the English language.