(oops, I was wrong)
The Bohse Sprinter was VW-Based and the Bohse Euro-Star was VAZ/Lada based.
The puzzle car is probably the original Bohse prototype, which was, as stated, VW-based, and constructed in 1987. Bohse and VW could not come to an continued agreement, so Bohse went with Lada components instead.
That is all the information I can find on the puzzle car. Unfortunately, I have yet to find a single picture of a Bohse with round headlights, as shown.