Sonnar red T, 
lens for rangefinder camera
50 mm, f/2, Contax (Kiev) mount, s/n 2854208, 
Carl Zeiss Jena, Germany

Good condition. Lens is clear and clean, does not have any fungus. Front glass has very small cleaning microscratches. Inside there are microspecks of microdust. Aperture ring rotates tightly. Body has signs of age.

 A round metal ring, that is inserted into the camera body, is not fixed (see photo #7-8). I do not know whether it is normal for this lens (Soviet copy "Jupiter-8M" has this ring fixed). If that is not normal, it can be easily fixed with tightening the screwbolts or glue.
I mounted that lens on "Kiev" rangefinder without any problems. Camera "Kiev" is not included.