4-view drawing of a Faun Z912/21-155 german Bundeswehr artillery tractor. Build between 1961 und 1969, about 60 were made. The service designation was ZKw 10T glw (6x6)
Additional info obtained from:

Karl Anweiler, Rainer Blank: Die Rad- und Kettenfahrzeuge der Bundeswehr 1956 bis heute, Bechtermünz, 1999, ISBN 3-8289-5369-7 p.201,211,212
Own work
Alexpl