UBB.threads Forums Edged Weapons SS Dagger Forum Transitional SS Eickhorn:

Blades as well as other parts were often sub-contracted to blade or other specialty firms. Tang marks are sometimes the marks of those firms and sometimes indicate different time frames. The entire story of the tang marks has not been told and we may never know what some of them mean. Whatever they mean IMO they are a VERY positive indication of an original blade.
A very fine dagger you show there Pat.