I received a copy of the summilux 35mm pre-asph lens and noticed that it lacked a shroud or any metal rim to protect the rear element. While a "overly" protruding shroud may prevent proper function on some cameras, the lack of any protective shroud makes me concerned that the rear element will eventually be damaged. Looking at the back of the lens, I would not risk setting it down on a flat surface, but this may occur at some point.
I am concerned that there was a shroud present at some point, but it was removed. If the shroud was removed it would be difficult to replace assuming that Leica does not stock parts for these vintage lenses. Having the part made would be challenging without the detailed specs and without knowing whether it threads into the space around the rear element. I'd just hate to start using this lens without adequate protection of the glass surface.
Does anyone know if some of the summilux 35mm pre-aspherics were manufactured without any shroud or protective rim? I have not found any examples of this in my research, so I suspect its a missing part. Thanks for your thoughts.