Thanks everybody for your comments and advice it's much appreciated. 
 
I have had a good read through the threads on mandaus and it certainly is a wealth of information, 
 
I've attached some better pictures of the convex/concave blade to help with identification. 
 
I look forward to more comments, thanks again, 
 
Ade
		 
		
		
		
			
		
		
		
		
		
		
		
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