Hello Robert, 
 
I'm not a great expert but I saw many Mandau in the Internet and books. 
 
In my opinion your blade is at least 80 years old. 
 
1: The shape of the blade and its size 
2: The unusual handle, which I like a lot. All modern Mandau I know have either a poor handle (tourist swords) or a traditional handle. 
3: The fuller seems old style 
 
I believe your sword is old and was probably pretty early collected by western traveller/ missionars. 
 
 
Roland
		 
		
		
		
		
		
		
		
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