Thanks a lot for your replies gentlemen!
Thanks for the image from the museum in Ljubljana, Victrix. Can you tell how the sword with the crosses on the crossguard is dated on the information-plate?
The link to the Byzantine empire is very interesting. If ound this image of the Varangian Guard, showing indeed a similar shape of the axes blade.
Is it possible that those half-moon shaped axe heads stem originally from the Indo-persian and Ottoman region (like the Tabar), then was adopted in the border regions (like Byzanz) and later in central europe (like you can see on this image:
https://www.pinterest.de/pin/345580971384969527/ )?
Best regards
Andreas