Hello David, 
The pamor pattern of your blade is difficult to identify with some certainty because it is scattered and significantly worn-out. One assumption would be pamor tambal (patch) but I would rather think that it used to be a full pamor pattern such as lar gangsir (cricket wings) but eroded with time. Other opinions are welcome. 
Regarding the style of hilt, I agree that it probably originates from Solo but am not sure that it can be classified as Narada Kandha because of its unusual curved shape, see a more typical specimen. 
Regards
		 
		
		
		
			
		
		
		
		
		
		
		
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