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Yeah that is black carbon. In the older times in Solingen these file marks on the lower part of the tang were integrated in the drop forge that produces the blanks. From the 1970's on the blanks were...

Very interesting example Bob.
Indeed the Deutsches Reich Patent was only used until 1945. Since Henckels developed the ice hardening, which they patented under the name Friodur in 1939, we coulkd...

From the 250 anniversary model exist some etching and color variations.
Here is a pick of two variations in my possession.

317948

The first has a blue etching, the twins are placed in a red...