Good point about the spinal curve, although I note  it's pretty slight curve; I went back to some old threads and couldn't find a Mandaya example with any. 
About the "high shinogi" I'm not sure you're correct; it's my impression that this feature is not universal. 
Mind you, I'm not saying it is Mandaya; I don't know what it is; I'm saying I see an awful lot of similarities, and I bet something accounts for them.  My inclination overall is that this is a form of parang nabur with a hilt similar to a Madaya dagger hilt.  I'd sure like to know more.  It's got that great helpful provenence; "Philippine 47" on a little paper tag. 
BTW: "headhunter......cannibal.....?"
		 
		
		
		
		
		
		
		
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