What defines a true Russian diver?
Or what makes a Russian diver unique?
For me personally whenever Russian divers are discussed among collectors, the true/authentic Russian diver refers to the vintage Zlatoust diver that ceased production in the 70s and the new reissue 192-ChS produced by the Agat Factory.
The issue was that someone in Russia decided to make a whole range of similar looking type watches and gave it a spin by creating different dials, having lens guard and engraving on the caseback, etc and started selling them in Russia as souvenirs to tourists. These watches then made it on ebay and to a few online sites and sellers falsely claimed that they were "true" Russian divers produced in the 70s by the Zlatoust factory. They started packaging these in boxes with Russian markings, certificate of authenticity that they were made by the Zlatoust factory and started making a fortune.
These watches are not fakes, they are homages. But to claim that they were made by the Zlatoust factory is wrong. Something Invicta claimed as well to their Russian divers until they got burned (the link by hobbit explains this). There is only one diver produced by the Zlatoust factory and it never had a lens guard, had sterile dial and a sterile case back with just the serial no.
Here's a good post by TLex on this
http://oceanictime.blogspot.com/2011/03/zlatoust-192-chs-vodolaz.html