Here is some info on the daggers. It should have the manufacture mark on the blade unless someone has polished it off. You might be able to use a strong magnifying glass to find it.
http://quanonline.com/military/military_reference/german/blades/army/armyhistory.php
http://quanonline.com/military/military_reference/german/blades/army/armyhistory.php