According to Jose Manuel Lopes, "Brand of the former RDA, from the A.R. Kühn factory, produced at least from the 1930s up to the 70s. Classic shapes, ebonite stems. Stamp: 'ARK / DDR'. Symbol: 'K'"
Lopes, Jose Manuel, Pipes: Artisans and Trademarks, Quimera Editores, 2005, p. 51