What's this, for 1 point?:
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Experts?
Karl Meier VW coupe (He went on to establish Kamei tuning company)
Dannenhauer & Stauss coupe ?
Hiawatha is right, it's Karl Meier's one-off coupé.
Here's a rear view:
These coupes were built at Heinrich Schwen's workshop, when Meier still was employed there. So in fact it is rather a Schwen coupe: