These next specimens are a species of Chonetes that come from the Kerpen mbr. of the Cürten Formation (Devonian, Givetian stage) near Sötenich, Germany. They resemble the Devonochonetes scitulis that I find in my local Devonian rocks such as the Mahantango Formation of Pennsylvania or the Arkona and Widder Formations in Ontario.
Specimen #1 Pedicle valve
Specimen #2 Pedicle valve
Thanks to Nils for the specimens.