This LEICA SUMMILUX 50mm f/1.4 manufacture between 1969 - 1991 was LEICA's standard ultrahigh-speed normal lens from 1961 until it was replaced by the LEICA SUMMILUX-M 50mm f/1.4 ASPH in 2004. Even though the newest ASPH version throws a lot of technology at the problem, it's not much better than this lens!
This traditional non-aspherical (spherical) lens was LEICA's, and thus the world's, best for over forty years. Even today, its performance continues to exceed the newest 50mm f/1.4 lenses from Nikon and Canon. It takes 43mm filters, weighs 360g. and focuses to 1m.
This is a USED lens, excellent condition. The glass is clean, no visible marks or scratches. There are some small marks on the lens barrel, but nothing significant.