I took a chance and bought this on E-Bay. The glass is amazingly clean and clear no haze fungus scratches or cleaning marks. What puzzles me is that it displays slight iridescence as if coated. I don't believe that LEITZ was coating lenses of that year. Can anyone offer an explanation for the colors? I have older ZEISS glass that is bloomed however have never heard that LEITZ glass undergoes the process. The photo was made under overcast grey skies so there is no blue present.