I once owned a Zenit 12, which weighed around 640 grams. You can find cameras heavier and lighter. There are different models, I believe the 12XP was the latest and had LED viewfinder lights vs the earlier match needle. All are TTL metering.
Viewfinder coverage is small, maybe around 60%, but it's a such a nice camera in your hands. Get one w/ a Helois 44 lens and you will have image quality as good or better than almost anything made at the time, or since. I never had any pics that were bad due to the small viewfinder coverage because nearly always my subject is right in the center of the photo. Anything unwanted can be easily cropped, but that never came up. Better to have it and not need it than need it and not have it.
The best bet is to buy one and send it out for a CLA, or buy one that has been serviced. Mine made killer photos, that Helios lens is amazing. It has just the right amount of softness wide open for portraits, and 3D sharpness when stopped down a little.