Nice pedang!  I am not sure about the age, hopefully someone more knowledgeable will add a comment, but to me it looks like it might be circa 1950.  The U shaped insert piece near the handle is supposed to be a magical imprint of the smith's thumb, but yours looks like more of a nod toward the form rather than an actual example.  Usually this is where the tang is inserted into the blade, but yours just looks like an inlay of some sort.   
 
I have a general question about pedang of this sort.  Does it show signs of differential heat treatment or hardening of the edge?  Alternatively, is the edge made of a higher carbon hard steel, or are the patterns just decorative? 
 
I have seen hardened edges on newer things and no apparent hardening on things that look old, but I would like to know what you think of your example in particular, and what others think of the topic in general. 
Thanks, 
Josh
		 
		
		
		
		
		
		
		
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