It is C A H, it stands for Carl August Hartkopf,a sub contracting drop forging smithy, that provided Eickhorn with many forged blades.
Hartkopf was Eickhorn's father in law and is known to have supplied the Eickhorn firm with SS dagger blades. My example has the CAH stamped on the tang as well. The etch and blackening of the examples I've seen by this firm are top notch.
Jim
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