This item is a 1950s vintage Canon SERENAR 100mm f/4 Leica mount M39 lens.   This lens is used on Canon rangefinder camera models V, II-D,  II-F, IVSB and Leica M39 cameras..  It is in excellent cosmetic condition.  There is no corrosion or pitting on the chrome finish.  The glass looks clean and clear with no noticeable scratches, haze or fungus.  The focus is smooth.  The aperture is also smooth and works properly.  It comes with front and rear lens caps and a Kenko UV filter.  It also comes with the original lens case.  There are no tears in the leather or rusted buckles.  It is scratched up, but it could easily be polished to look almost like new.