As much as I hate to do it, it's such a cool lens, I'm selling my 50mm Summicron APO. I have moved on to the S system.
I bought this lens new from Leica Miami and it was rarely used because of the S system. I'd call it mint, but look at the pictures for yourself. I'm including the B+W filter shown in the pictures.
Asking $6,200. Will ship US only.