It's about 5 feet long !!
At first I thought it was a spear, but it is so light I just cannot see getting any weight behind a blow.
As you can see it is also notched, which suggests to me that it is designed for a bow and not to be thrown or launched from some sort of spear thrower.
The head is carved bamboo and the shaft is some type of hollow reed, as I said, very light.
To me it is similar to New Guinea items in construction, but the wood is wrong and I have never seen them fletched.
South American perhaps ? I know nothing about this area and am not allowed to look at Amazons
All suggestions welcome
Regards
Roy