Unique M39 2/35mm Leitz Summicron lens used by Henri Cartier-Bresson with his black paint IIIg camera: the black paint 8-element lens (with very clean optics) was transformed from the original M-mount lens (0.7m, red plastic dot) on special order by removing the bayonet ring. Also the focus-tab was modified by removing the infinity lock and an extended lever was built-in. The lens has the same index dots made with nail gloss as the famous 2/5cm black paint collapsible Summicron used by HCB. It comes with both caps and a confirmation of authenticity by Lars Netopil from April 2015.
Photo credit: © WestLicht Photographica Auction