This is a Zorki 4 with green covering. Zorki 4 - Type 5
These cameras were produced by factory "KMZ" (Krasnogorsk) since 1956 up to 1973.
About 1,715,677 copies were made
This camera was very popular in former USSR. Frame size 24X36mm
The number of shutter speeds and inscriptions ZORKI-4 were engraved before 1965, and painted - after 1965