Here is a nice clean NSKK dagger. The NSKK (Nationalsozialistisches Kraftfahrkorps) or National Socialist Motor Corps was originally subordinate to the SA. Hence the dagger itself being almost identical to the SA daggers, except for the lack of a Grüppe code on the cross bar and the black sheath. The NSKK was basically an education arm of the SA intended to provide a means for members to learn how to operate motor vehicles.
This example is RZM marked to M7/73 for F. ü A. Helbing of Steinbach.