Hi Dave...these tang markings denoted either the producer .... OR..... the sub contractor who provided blade blanks to producers.

In your First photo CAH / Carl August Hartkopf foundry

listed producers with CAH tang marking

Gebr Berns
Cark Eickhorn ( SA SS NPEA )
Hammesfahr & Cie
Gottlieb Hammesfahr
Robert Klaas
Gustav Spitzer
Carl Zander

Although there is no documentation on the identity of A series numerals ..it has been documented that what other producers had been observed having these A series numbers within a circle.

It has been observed that A22 was produced for Jacobs
also to note that Eickhorn used A23 and a few other non A series markings.

This is another way to at least seeking a possible identity of a producer who either produced their own blades or at least pointed in the direction of those producers who are observed to have used these markings.

Regards Larry

Last edited by Larry C; 11/26/2022 02:26 AM.
Historical Stewardship is a Trusted Honor that must be kept!