Switching back to KMZ for the remainder of the Soviet portion of our tour, we have a Zorki 4 rangefinder. The Zorki 4 was a modernization of the earlier designs. It boasted simpler controls, a single combined rangefinder/viewerfinder and a removable back. It was produced in large numbers (1.7 million) for many years (1956 to 1973).
This example was produced in 1970 with a Jupiter 8 lens. The lens serial number starts with a 01 and it has the KMZ logo. But it does not follow the KMZ convention of the first 2 digits indicating the year of production. It was not made in 1901 or 2001. Most likely it was a warranty replacement. I received it on the camera with a FED lens cap.
Another photo showing the detachable back. Mouch easier than bottom loading.