Hi PBW,
Just having a look before bed and all I can find is an unbuilt project by Jean Delemontez. However, it is called a Jodel in the article I found and the dihedral mentioned is not as per the drawing!!
Perhaps these are errors and it was called the Delemontez D12 ??
The Jodel D12 was a project study for a tandem two seat all metal aircraft carried out by Jean Delemontez. The wing planform was similar to the D11 but the dihedral began at the wing root. The empennage had an all flying rudder similar to the D11 and a rectangular tailplane and elevator. The engine was to be ex German 240 hp Argus As10C. It was never built.
Some parts fit your clues others don't
What year was it? Is the drawing on the web?