Here is my mini collection of arrow points.The one in the center could have been for a spear.
... and a diagram with dates attributed to finds in the State of Pennsylvania.

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Fernando thank you for adding this very useful chart and showing these interesting examples of arrow heads. I had no idea your collecting scope was so eclectic!
I guess there is enough variation in the knapping style of the heads or possibly the fletching character might have indicated tribal identity.

So ... eclectic i am, Jim; as long as you don't call me a hoarder ... just kidding ;).
Actually these points were a friend's gift; and the Archaeologist that identified is my friend's friend :cool: .
I am glad to have ended up having the real thing; all thematic places i visited in the States only had replicas selling for one buck, just made the other day ... and potentially by non Natives :shrug: .