Some interesting links that illustrate how problematic area and tribal attribution can be.
http://links.jstor.org/sici?sici=0016-7398(190610)28%3A4%3C368%3AJINN%3E2.0.CO%3B2-P
http://links.jstor.org/sici?sici=0368-4016(190807)7%3A28%3C374%3ANOTTOT%3E2.0.CO%3B2-R
I do not know why the links will not work

looking with a glass at the knife one can see that it does indeed have some age to it.