I have seen this gun personally and the rib matting is truly impressive.  It is the only example of this style of matting that I have ever seen personally.  It is more of a very fine knurling on the whole surface of the rib.   
This was a sort of transitional operation that was used to matte ribs before Parker used their typical cut method of matting the ribs.   
 
I am sure not many guns were made with that type of matting on them.
		 
		
		
		
		
		
		
			
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				B. Dudley
			 
		
		
		
		
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