Approx. dates of manufacture: 1965 to 1982
Approx. street value:$20
This is the older brother of my Zenit EM, a Russian SLR. Alfred's Camera Page has a really nice write-up on it, so I'm not going to duplicate much of it here. I found this guy at an "antique" mall for $13, which is a little less than it's worth IMO. It works and it's got a Carl Zeiss Tessar on it (as opposed to Russian optics), so I grabbed it.
They made this thing from 1965 to 1982, which is a very long run for a modern camera. It has (like my EM) a screw-mount lens, but The E model started out using the M39 mount (which is compatible with Leica rangefinders) and changed over to the M42 Pentax/Praktica mount in 1967. Mine is an M39 mount, the first one I've ever owned. Most M39-mount cameras are financially out of my reach.
Russian cameras are technologically backward, but they tend to be hardy. Even the selenium meter still works on this beast, though I haven't checked it for accuracy. But the price you pay is a non-automatic lens, no TTL metering, a very limited range of shutter speeds, and no rapid-return mirror (you have to wind the film/cock the shutter to also drop the mirror back down).