Yes, it's a brass or copper bladed dagger from Luzon, a rare find! Congrats!!
See here:
http://www.vikingsword.com/vb/showth...t=brass+copper and here:
http://www.vikingsword.com/vb/showth...t=brass+copper for more information.
PS: you want to write "non-magnetic" instead of "non-metallic" I guess!
Regards,
Detlef