Beautiful old DARLOT LENS  from Paris.  Focus adjustment is crisp and smooth.  Glass is very clean with no fog, fungus, or significant scratches.  Unknown focal length.  Lens measures approx 4-5/8" tall and 2" across.  Signed "Darlot Paris" with a small symbol underneath that looks like a capital "D" with a sideways capital "A" or arrow intersecting it.  Lens and housing is very clean - brass housing has some scratches marks and mars as expected form a used lens of this vintage.   Lens comes from the private collection of a long time professional photographer who specialized in large format work with vintage equipment.  Please see photos for more details and to evaluate condition for yourself.