Sheldon Wickersham indicates in his writings that the Solingen blade were "1955 into 1979" that is the only written information that I have seen. I imagine that there is other books that have information on this, however I haven't read anything on the subject in the books that I have reviewed. I would think that Scott would know.

max
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"Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

RKCC #502