Mr. Maisey, 
 
Eagle eye your right , it’s not a scratch it’s corrosion but not through to the pesi  
There is still a 1,5/2 mm of metal left. And yes the blade could use a cleaning. But I will put it aside as there are more urgent restorations to be done.  
 
I took some better pictures.  
 
Regards, Martin.
		 
		
		
		
			
		
		
		
		
		
		
		
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