Hello Duccio,
	Quote:
	
	
		| a knife with a very corroded blade (deep rust then eliminated? Or what else?) | 
	
 Yes, I believe so - these swords are usually made from modern steel.
The corrosion seems consistent with the blade being wrapped for storage and then sitting with quite a bit of moisture for extended periods.
I also believe Gustav pointed to the likely owner. Let me know if you decide to part with this piece, please!
Regards,
Kai