I think it's legit. This looks too good to be a Chinese knockoff. Plus, American imporer Timepeace "Vremir" caseback is so obscure, I doubt it was faked. Quite a few western companies got involved w/ Vostok as the markets opened up. My first Vostok was purchased from an American catalog company called "Wireless," who sold the more popular Komandirskie models fitted to nicer leather straps. We've seen on this forum the Italian importer who also fitted their own casebacks, straps and cases to Vostoks, Poljots and Raketas in the late 1980s.
My theory is that these enterprises ultimately failed due to the dropoff in quality that came with the fall of the USSR. The three Komandirskies I bought in the early 1990s all failed to work for one reason or another after about a year of use. It wasn't until last year that I redescovered these watches and learned how much better they were before the collapse -- and how much better they've become since.
There was a great appetite in the West for Soviet products in the late 80s/early 90s. I remember around the time of the collapse there was an article in Newsweek about a plan to sell the UAZ-469 through US dealerships as a low-cost competitor to the Jeep Wrangler. Like Vostok, though, the factory went through a period of chaos and QC issues after the collapse, reliability ws impacted, and the plans fell through. Too bad, too -- I'd love to have had one of those.