Jupiter-8M red P, 
silver lens for rangefinder camera
50 mm, f/2, Contax RF (Kiev) mount, s/n 6038147, 
"Arsenal" plant, Kiev, USSR, 1960

Very good condition. Lens is clear and clean, does not have any fungus or scratches. Inside there are microspecks of microdust. Front glass has a cleavage near letter P. Body has small signs of age. Aperture ring rotates properly.

Camera "Kiev" is not included and shown as an example of mount.

This is a normal lens with high lens speed and anti-reflection coating for rangefinders. Lens was default for cameras "Kiev", "Zorki", "Leningrad". 
Lens was based on "Carl Zeiss Jena Sonnar" 2/50, which was designed be Ludwig Bertele in 1930-32. After the II World War technology, materials and spare parts were moved to USSR. 
Lens was produced since 1948 for M39 mount and since 1956 for Contax RF mount.

Characteristics: 
Lens s/number - 6038147
Number of lenses - 6 in three groups, Sonnar
Angle of view - 45o 
Number of aperture blades - 9
Limit of aperturing - 1:2 (max), 1:22 (min)
Resolving power - (centre/edge) 30/14 lines/mm
Minimal distance of focusing - 1 m
Type of thread - Contax RF (Kiev RF) mount
Type of filter thread - 40.5x0.5 mm
Dimensions (mm): 47*37*37
Focal distance - 52,49 mm.
Mass - 126 g
One-layered anti-reflection coating