I agree David, the blade is earlier than the rest. MOP was actually used before WWII, but not earlier than the turn of the 20c. However, so much MOP is a later use. I there also agree that is maybe circa WWII MOP fittings.
Also the front of the ganga is Sulu type and the blade has a little Indonesian style to it. Still I would say Sulu region as the place of origin.
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