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The Leica Summicron-M 50mm f/2 Rigid Version 2 (factory code SOSIC/11818, 1960–1968) is a classic double-Gauss design with 6 elements in 4 groups. This second rigid variant features improved coatings and a revised mechanical stop-down system over the 1956 original while retaining the same optical formula. Produced in limited numbers during the transition to the M bayonet, it remains one of the rarest and most sought-after 50mm Summicrons in silver chrome finish.