I found photos on the Zvezda's forum from one of the expansion sets for the boardgame "The great patriotic war".
It's a T34/76 1940 version in 1/100 scale!
The box contents one info card of the model for the game, one instructions booklet and the model!
A closer llok to the instructions, which imho is the easiest one in the whole modelworld:
Today is building time
14 minutes ago