Hi All,
For information, Mr. Ton Bolk (from Bolk Fine Antique Firearms and Armor, the Netherlands) is 100% sure this katzbalger is actually 16th century). He strongly stands on it.
Interestingly, I sent today high resolution pics to Mr. Gilbert Putterie (& Yvon Leyssens) from Magazin Royal (Belgium), who sell Antique Swords, Firearms and Armor from the medieval and renaissance period (with 30 years experience in field; they also represent Czerny's auctioneers). He said the katzbalger is clearly 16th century (metal, patina, construction, etc.)
Hope this helps,
jm