Parallel series: Production

The production figures cited here come from KMZ.
You can find details by year, on http://www.zenitcamera.com/catalog/cameraproduction.html.

Zenit 7:3024ex between 1968 and 1971
"Modern" design, triple lens mount with M42 + external bayonet +internal bayonet; automatic diaphragm.
Zenit-D:63ex in 1969 and 1970
Fully automatic body, based on the Zenit 7
Zenit 16:11124ex between 1972 and 1977
Also a very special design; one of the first 135 reflex cameras with a plastic body. Textile vertical curtain shutter, unreliable.
Zenit 19:121993ex between 1979 and 1987
Semi-automatic, metal curtain shutter.
Zenit 18:7001ex between 1980 and 1987
Automatic, aperture Priority, derived from the Zenit 19; deemed unreliable. Dedicated lens Zenitar ME-1
Followed several prototypes (20, 21, 22) equipped with a K bayonet, giving rise to the Zenit Automat.
Zenit Surpriz MT-1:(no production statistics)
Camera for the medical photography, derived from the Zenit 19, 18x24 or 24x24, bayonet mount for special lenses or an endoscope, data-back, no meter.