Emanuel, 
 
Could it be possible that this flyssa originally had a straight blade, which was crudely hammered into a down turning one? You have the sword in hand and can judge better if this is a plausible scenario or not, but the crude lines suggest to me that the blade may have been altered at some point. 
 
Regards, 
Teodor
		 
		
		
		
		
		
		
		
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