Thanks for the further comments!
Of course - if doing some restaurations on it, it will lose its untouched character. This is why I would only do reversible restaurations. But anyway, in the foreseeable future I won´t find the time for it.
While the linked book (
http://www.vikingsword.com/vb/showth...light=cabasset #7) dates it to the first half 16th century (1500-1550), I found some examples in the internet dated the same period, and others dated around 1600, as Ulfberth also mentioned.
This one is attributed to south Germany (perhaps Landshut), which would fit to my one beeing found near Munich:
https://worcester.emuseum.com/object...4104f5cc&idx=3