So I'm a total dork, so I ordered BOTH the blue and the black (grey). For those of you that may have similar indecision, I've posted a few pictures of each to my instagram (@relosiggy). I've also posted a few pictures of both the blue and grey next to each other here:
I don't know how to link those pictures back to this forum!
My observations: These are darn cool watches! To me, they run a "small" 39mm and disguise well as dress watches similar to current minimalist trents without being gawdy at all. I've suited them up, but also strapped on a nato. They both are showing +4s to +17s on Frederique Constant's Analytics, which is absolutely adequate for me (beat error 0.1ms across the board; amplitude 300-328 dial up, 250 crown down). That accuracy is just fine with me! The watches come on an alligator-like leather strap which seems fine to me (others disagree). The clasp is very "toolish" and brushed, which doesn't quite match the dressy nature of the Classica. Both watches are uniquely numbered, as previous posters have noted. A nice touch from Vostok was that they got it through US customs with no charge to me (well played), though it did take 20 days to arrive.
Color-to-color: The Blue comes on a VERY dark blue leather strap. The dark blue leather is dark enough to not be annoyingly blue, though one of my coworkers did notice it was blue when I showed him this watch (he's a fellow WIS). The dial is very dark but still blue, and only shows a hint of sunburst in most light. It sometimes looks indigo, sometimes black. To contrast, the "black" dial is really a dark grey sunburst. The sunburst on this one really shines well. The black (grey!!!) comes on a black leather strap.
Hope this helps for those considering!