Zorki-4 (-4), vintage rangefinder film camera
 35 mm, M39 (LTM) mount
#5721851
Krasnogorsky Mechanical Plant (KMZ), Krasnogorsk, USSR, 1957

Sold as not working (for parts). Shutter can be cocked but pushing the release button makes no effect. Rangefinder and dioptric adjustment work properly. Body has signs of age. Lens is not included, body only. Take-up spool is not included.

"Zorki-4" was made since 1956 till 1973 by Krasnogorsky Mechanical Plant named after Zverev (KMZ), Krasnogorsk, USSR. This is the improved version of "Zorki-3S" and the most popular and the best camera from "Zorki" family. 

Word "Zorki" can be translated into English as "sharp-sighted, observant". 
Camera has a united viewfinder and rangefinder with one common eyepiece. Rear aluminium cover is removable. Eyepiece got a built-in dioptric adjustment.
 
Camera can use standard film cassetes and dual cylinder cassettes from Leica. Default lenses are "Jupiter-8"(2/50), "Industar-50"(3.5/50). Of course, all lenses with M39 (LTM) mount fit this camera. 
Flash synchronization synchrocontact and self-timer are present. Tripod socket 1/4" and cold shoe.

Shutter is cloth and moves horizontally. Shutter speeds are: 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000 second and B.
Totally 1 715 677 cameras were made. Price for that camera was 38 Roubles with "Industar-50" and 47 Roubles with "Jupiter-8". When exported abroad had a name "Aurora".

Two version are known: with barrel shutter lead up (early) and cock shutter lead up (late). The latter had a name "Zorki-4K". Totally about 2,3 mln pieces of both cameras were produced thus making this camera the most popular system rangefinder camera in the world.
This is the early version of the simple "Zorki-4" with prominent frames around viewfinder and rangefinder windows on front panel. Name of the camera is engraved.

Characteristics:
S/number - #5721851
Frame size - 24x36.
Shutter speeds - 1-1/1000, B.
Type of thread - M39x1/28.8
Body - aluminium.
Dimensions (mm): 143*92*35
Mass - 600 g