Cool poster!
Was that their one millionth tractor produced?
I think the poster was just promising one million tractors as part of the five-year plan. Unfortunately for the Russians, I don't think they got that millionth tractor. The factory in the background had to be converted to making T-34s instead, of which they did make a million. At least it seemed that way to the Germans.
One of the many reasons the USSR failed was that the factory never got converted back to making tractors. It just kept making tanks even though the war was long over.