Fantastic posts Jim and Joe!! 
Thank you very much! 
I will submit my full reply a little later, but I've found a picture and mention of a 16th century Italian sword with extreme bi-concave curvature along the spine. I have yet to scan it, it actually looks like the literary impression of what scimitars may be.  
Will post in the coming days. 
 
Warm regards, 
Emanuel
		 
		
		
		
		
		
		
		
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