This coated Kodak Anastigmat 50mm f1.6 cine lens with S mount serial number EI 1358, was manufactured in 1948 and is designed for 16mm motion picture cameras.  On such cameras, this 50mm f1.6 is a telephoto lens roughly equivalent to 100mm on fully frame 35mm. This lens has a maximum aperture of f1.6 and a minimum of f22.  It's focus range goes from infinity to just under 2 feet.