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					Originally Posted by Unclebob
					
				 
				I found this very large knife recently; It's 2 ' long and weighs 4 1/2 lbs. It has a nice convex cross section and the false edge is sharpened. 
 I don't believe it's a machete, with the clip point. Any ideas? 
			
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 Welcome to the forum!
I would say it is a modern blade somehow corroded.
The very uniform and spongy corrosion points towards an intentional exposure to some kind of acid.
My two cents...