Back to Zenit-ES Flat bottom. I think I can say with fair certainty these cameras existed by themselves. The two examples below I've purchased in last couple of weeks. They both came in the standard Zenit-E leather case. These cameras are:
Zenit-ES - domestic (Cyrillic logo) flat bottom. Unmarked bottom place (matches domestic type) - comes from Israel, seller says bought the camera only
Zenit-ES - export (Latin logo) flat bottom, bottom plate matches the export type - that is says "Made in USSR" in English. seller says bought at estate sale in USA.
I took off the bottom plate, the cameras are in fact same as come in FS-2 kit - that is both ES's have the little pedal on the bottom for the shutter release. Photos below. My guess is, KMZ made more cameras than they had the TAIR-3 lens and the kits so it was very simple to put the flat bottom on it and sell separately.








Your thoughts?
Vlad