Issued by Ludwig & Mayer in 1915 with a halbfett added in 1926 [Reichardt 2011]. The samples in Wetzig erroneously suggest there was only a single weight, made in-house in 1914 and reissued in 1926 [Wetzig 1926–40]. Erroneously shown in Klimschs Jahrbuch 1920 as Krupp-Hallo.