ARK
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'"
Notes
Lopes, Jose Manuel, Pipes: Artisans and Trademarks, Quimera Editores, 2005, p. 51