"Rare" means they weren't any good in the first place so not many were made and they were crappy and didn't hold up very well. On eBay it means the seller is desperate and really needs to hype his crap up...
"Excellent condition, few cosmetic marks and scratches, viewfinder distorted, exposure meter appears to work (not tested it), broken flash and battery coverer [sic] missing."
It's high time bloody amateurs got their descriptions right on eBay. It is a joke reading through many pages. I reckon 99% of the time sellers of photographic equipment are in red hot pursuit of a dollar with a good prospect of overtaking it. They just do not know what they are talking about.
Rare in eBay terms is finding solid fact amongst a welter of fiction.
I've seen a few Ukrainian-based auctions mention that the camera has been tested for radioactivity and is safe on that score, I guess in case you were wondering if the seller had scavenged it from Chernobyl. That would be a rare camera!