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The Leica Summicron-M 35mm f/2 Version 4 (factory code 11311) is a silver chrome rangefinder lens produced in Wetzlar, Germany, featuring a 7-element 5-group optical construction of modified Gauss type. This final pre-aspherical iteration is distinguished by its rounded aperture blades and characteristic smooth bokeh rendering. Renowned among collectors for its exceptional optical performance and mechanical precision, the 11311 remains one of the rarest and most sought-after Summicron-M variants. A+ cosmetic condition.