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Rare w paper almost first version ( starts from 1400000-1401000 dated 1956) Leica summicron 50 2 dual range ( DR) . The best Leica 50 2 ever . Sn 1473474 fell correctly in the range of 1473001-1477000 4000 units dated 1957. Original coating  and original certificate. With E39 silver filter, front and back Leica cap . No Close focus attachment .  ( the close up googles for my another late version 218 n not for sale ) Buddies only given the age without scratches , mold , haze. Full of history ,the previous owner Mr Lyon mostly purchased a M3 DS SN 864067 w this 50 2 DR. Price firmed. Photo by MP with Kodak vision 3 250D

https://cameraquest.com/m50dr.htm

https://slimkamera.pixnet.net/blog/post/21796037

https://www.kenrockwell.com/leica/50mm-f2-dr.htm