This Zorki-6 is a later version of the Zorki-5.  There are some small differences but the major ones are that a self timer was added.  Also a swing back makes the Zorki-6 easier to load film. This particular camera has two issues.  The shutter does not work reliably at all speeds.  Also the lever to advance the film does not snap back to its park position with the spring like it should.  Overall the camera is in nice physical condition, the rangefinder and self timer both work.