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The Leica Summicron-M 35mm f/2 Version 4 (factory code 11310), produced 1979–1982 in Canada, is a 6-element 4-group Double Gauss derivative featuring one anomalous partial-dispersion glass element. This final 7-element evolution of the classic Summicron optical formula is renowned among collectors for its exceptionally smooth bokeh signature, earning the “King of Bokeh” designation. Extremely rare in factory black paint, the 11310 remains one of the most sought-after M-mount wide-angle lenses of the Leica film era.