Thank you all Gentleman, for your input. 
I guess i am now reconsidering Gene's first hint. 
Indeed if no evidence shows up to prove otherwise, it is quite plausible that this is a handmade throwing knife blade assuming, as suggested by Broadaxe, that its large dimensions were meant for public show, such as in a circus. 
This is quite a different approach as it would explain the difference between those elegant stylized factory made blades and this rather sturdy and irregular example 
Fernando
		 
		
		
		
		
		
		
		
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