Hi bc,
Orders for AIF, para 60, approved the title NBT in oxidised copper, while para 61 approved the hat/cap badge. They both appear in Price List of Clothing 1915-16.
So being official it would certainly have been die-struck but the possibility that these badges were obtained in Egypt in cast form cannot be discounted. In fact as neither the army nor the navy really wanted the unit they probably had to scrounge everything they needed anyway.
Keith
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