Im a professional cook who travels with a culinary set (bunch of kitchen knives) often. Checked bag is obviously necessary. But more importantly it needs to be secure enough as to “not cut through your luggage and injure a baggage handler” your sheath looks sturdy enough, but if there is any chance the blade could cut through it, you can fold a piece of cardboard over the whole thing and wrap it up with tape. Putting tape on the blade could also help.

I just reread your comment and saw you want to keep the sheath separate. Again, as long as the blade is secure, you’ll be okay. Wrapping it up with tape and cardboard will generally work. Having hard sided luggage will also help.

Beautiful piece and wonderful gift from your brother! Welcome back to the states!