Old Bronze (I Believe) Harpoon Head / Dart

I believe this harpoon dart would have been used for whaling, or game fish (tuna, sword fish etc), and could either be used as the head of a spear or threaded with a rope.  I think it is a pretty old one, and I believe bronze rather than brass, showing a bit of greening. I just really love the arrow form, which could be used as a sort of finial on something, or placed on hung pointing in the right direction!

4 5/8" l x 2" w x 5/8" d and in very good condition.