These early metal axes are at the transition between flint, copper and early bronze, just when metalworking was being introduced. 
The axe is 95 mm long and weighs 177g, the cutting edge 37mm.
Silicone moulds taken, lost-wax investment.
These earliest small axes were cast in open stone moulds and then refined by hammering, using fine-grained hammer stones that fitted the hand. There are no bronze hammers  known from this early period.
The form of the axe is very much that of a later Neolithic flint axe, only smaller. Early smelting technology  being the limiting factor to size.
Hafting was in a cleft elbow crook with just the first third of the axe protruding from the binding.
This head could be hafted vertically and used as an axe or hafted horizontally and used as an adze.