David, I cannot confidently give a classification (tangguh) for this big blade from a photo, but I can very confidently say what it is not, and it is most definitely not a Surakarta blade. Not one single tell relates to Surakarta. 
 
Where are these experts who think it is Surakarta located David? 
 
Incidentally, "Alan" will do just fine.
		 
		
		
		
		
		
		
		
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