Boker USA Knife Found Need Help Dating Please

[BrooksWard]

I found this old knife in my wife's Grandad's garage, and I was wondering if anyone could help me date it. It has Boker Tree Brand etched in it and the number 163 at the base of the blade.

Here are two pictures:

 

[Marketing]

am I the only one who can't see the pics?

 

[brownshoe]

No, I do not see pictures as well.

 

[jbmonkey]

cant see the pics either