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The Leica APO-Summicron-M 50mm f/2 ASPH (factory code 11187) is a limited LHSA special edition finished in silver chrome. Its optical construction is an apochromatic Double Gauss derivative with 8 elements in 5 groups, including two high-refractive-index glass elements, one aspherical surface, and anomalous partial dispersion glass to eliminate chromatic aberration. Produced in extremely small numbers for the Leica Historical Society of America, this variant remains one of the rarest APO-Summicron-M 50mm ASPH editions.