Sorry to correct you, but the answer is wrong. It is not an Imperator as that was the V8 engined gullwing coupe. The Spyder had smaller engines fitted and was just called Isdera Spyder. There were different versions: the first one from 1982 was the 033i with VW Golf engine, succeeded in 1985 by the 033-16 with a 16V Mercedes-Benz engine. In 1987 came the 036i with 3 liter Mercedes-Benz six-cylinder engines, of which we can see the puzzle picture. Of all versions, the above mentioned 17 units were built.