Thank you so much Lee, for the clarification on the grooves and all the other impressions. 
I have made close up pictures of the half-moons in both blade faces. It appears they were not chiseled, but instead stamped, judging by some defect occurred in both sides, making one thing the marks were done with a (same) punch device. 
... this if i catch your meaning and if i can see with the propper eyes. 
 
Concerning sheet-metal, and again begging tolerance for my layman's eyes, this one certainly isn't made with such material ... for what matters. As i said before, and just tested again, i repeatedly bend it and it allways comes back to absolute straightness. 
Fernando 
 
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						Last edited by fernando; 9th October 2008 at 11:54 PM.
					
					
				
			
		
		
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