While Vostok is a company that specializes in military timepieces, This Slava ('Glory') was a company that produced watches purely for civilian applications. It's smaller and thinner than the Amphibia and is a manual wind movement. I got this 80's model used at a very reasonable price, and it has Cyrillic day markers. I haven't seen another one like it. I don't use it on my sub-zero temperature walks, though, hehheh.