Welcome to the forum, df1967.
... And thank you so much bringing to us such splendid Katzbalger.
A slight obstacle could be that the inlaid mark is so fragile that parts (ends) of it might have fallen off, making it harder to identify ... at least for those not so knowledgeable, like me
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I assume that the Bidenhänder you show is already identified; a copper inlaid cross and orb of the same type is seen in a Swiss example dated 1580. (courtesy Scheizerischen Landsmuseum).
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