This is a lovely 3.5/50mm coated Elmar lens which can be used on all Leica screw mount bodies (as well as Canon, Bessa and other Leica copies). Additionally it can also be used on the later Leica M models if you have an adapter. 

This is a coated Leitz f3.5/50mm Elmar. The chrome finish is beautiful and the glass is excellent. This is an outstanding lens when you want a bit more contrast and a brighter color rendition than an uncoated lens can provide without having to spend a small fortune for the later (and expensive) “red scale” coated Elmar version. The glass is clean and clear. There are no scratches, just some light cleaning wisps and it’s capable of producing lovely photos on modern color and B&W films

All in all, a sharp, compact lens with that special Leica character that will perfectly complement your classic Leica camera.