These cameras were produced by factory "KMZ" (Krasnogorsk) since 1952 up to 1956. 39,019 copies were made
Frame size 24X36mm

Lenses: Industar-22 (3.5/50mm)
Lenses for Zenit-1 are here

Adjustable shutter speeds: 1/25, 1/50, 1/100, 1/250, 1/500 of a second and "B".