Presumably one of the first Sturmanskie brand chronographs available to the public, this chronograph features the previously released military-issue-only cal. 31659 movement with additional stopwatch function. The new round-style chromium-plated case, later to become known as the "classic" style case, was a recent and refreshing addition to Pojot's ubiquitous square case.
Could it be that the initial Sturmanskie branded chronographs available for retail sales featured the cal. 31659 movement only?
I purchased this seemingly nos chronograph without seeing the movement, so you can imagine my surprise when I opened up the hood and found a near mint-condition Soviet era cal. 31659!
The Sturmanskie dial matched with the classic round case and cal. 3133 movement would become a featured chronograph in all of the Poljot catalogues up until the company's demise.