Hi Michael,
Thank you for your answer.
Do you maybe you have a barrel with the same decoration in your collection?
can you then please post a picture of it?
yes Polish around 1600, a so called a czekan nadziak, could also be a possibility. see
http://www.vikingsword.com/vb/showthread.php?t=16469
Though I do not expect it, because it out of the Emden ruestkammer.
f/m the decoration is typically German, there are clear signs of combat use and the weight is 675gr similar to warhammers of this form, CF europaische Hieb und stiechwaffen p 273 warhammer 307 (690gr)
I do think the weapon is too ugly to be used for processional use.
best,
jasper