1912 Erfurt sn 1515a Central Powers Pistols p. 88, 89.  It bears 20.A.F.F.24 unit mark.  20. Fuss-Artillerie-Regiment Ersatz-Battalion (Horse Team) Waffe Nr. 24.  Rig includes matching 1912 dated hgolster, tool but the extra magazine from the book is missing. Holster same unit marked as Luger. One period correct but non matching magazine included.