Finally found this diver from Poljot. Poljot watches are mainly dress, chronographs but never a diver except this piece.
The condition is consider pretty good as the bezel is plastic, the markers are usually worn off and the second hand often replaced.
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Most Russian has 2 piece case back, in theory, when you screw a 1 piece case back, there may be instances where you are distorting the gasket as you screw down.
Poljot 2627.H movement
23 jewels on the rotor
Similar piece from WUS:Â http://forums.watchuseek.com/f10/poljot-2627h-service-repair-lots-pics-80497.html