By "accidental" I mean unwanted pamor and not unplanned pamor.  
If this was a Javanese blade, I would compare the motif with known ones described by Tammens or Van Veenendaal for instance but this is probably not applicable for a Balinese blade.  
This blade is well made and I doubt that the maker would have left an unwanted motif but I don't know whether it is a planned or unplanned one. The pamor motif looks to be superficial so it may have been made more recently than the blade itself. 
Regards
		 
		
		
		
		
		
		
		
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