I don't think we will find anything like it in any museum collections, it's one of a kind.  
The blade for sure is Iban and resembling a jimpul without (or with a lost crowit). The hilt is more tricky. 
I don't think it is close to any of the Bidayuh hilts, but maybe it could be a bit related with the Murut sangkit,  
as Maurice suggested (not the pakayun that Indy enclosed). Below are two examples as references.  
But still it's not 100 %. 
My guess is that, if not Murut, it is a coastal Malay Makara inspired handle.  
Maybe a cross cultural combination of an Iban who became Muslim and shifted his handle? 
 
Michael
		 
		
		
		
			
		
		
		
		
		
		
		
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