LEICA Leica External Viewfinder 50mm (5cm) sbooi Gmph Selling because I no longer use it. There is a slight verdigris in the recesses (evidence of brass chrome plating). The exterior shows some signs of use, but the bright frame is clean and there are no chips. It is a type that does not have a pin on the hot shoe side, so it can be used with the M6 with a regular shoe other than the Barnack. The Gmph is a rare item that is surprisingly hard to find.