Hi Lee,
Superb suggestion - we are eager to see the details!
The idea of a Katzbalger did not come from myself but from an absolutely expert friend who - in his field of late medieval and early Renaissance weapons - has about the same qualified expertise as I hope to be able and boast of
in mine.
Based on my cultural historical background though I can tell that Viking swords had either characteristic Brazil nut or trilobite pommels which the one in question is definitely not.
As soon as you have identified the Zurich Katzbalger I will search my photo archive as I photographed literally everything on various priviledged visits there.
Best,
Michael