Thank you Rick for your reply .
You are right ... just after your reply I browsed different sites and found a similar head spear with these comments :
" Rare Mandaya undecorated paneled spear head :
This exceptional piece was exhibited at the Pan American Exposition 1904.
A seldom seen spear head of the Mandaya people of East Mindanao made of finely watered steel; this piece originally from the collection of the Philippine Provisional Governor U.S. General Harold Bandholtz. Probably collected after General Pershing's order #11 to disarm the local tribes.
Shaft length: Shafts not included. When mounted this spear is approximately 274 cm long. Shaft wood is Palma Brava with forged iron conical cap at the end. "
Blade length: 31.2 cm
Source:
www.arscives.com