20 Pfg worker with overprint in mixed franking with 2 Pfg worker with overprint (overprint faked - 2 values) as correctly franked to the detriment of the post on cover from "KASSEL" to Lutter at the Barenberge at Kurt Klay, - the school in the city Lutter is named today "Kurt-Klay school", photo expertize Schlegel BPP