The Summilux 50mm throughout its entire production range displayed a '10M' mark on the distance ring. However within the very first batch of the first production model (TYPE 1) Leica sold an unknown number of lenses with an additional '20M' mark engraved on the distance scale. The lens offered for sale here is one of them with filter and rear cap. The lens has just received a complete CLA but still shows signs of age and coating damage. But this will not reflect tin the image results.