So I opted for BESDATA who seemed to have the same look as the original. At the reception, I'm a little surprised to discover a simple yellow padded envelope containing:
A shell back slightly transparent hard plastic in which the iPad is received quickly and through which you can still see the famous apple brand,
A front very similar to the original polyurethane Apple, with a microfiber layer on the inner surface in contact with the screen. This facade is provided separate from the back shell. There are no instructions on how to assemble front and back cover and it is clear that this is not really intuitive. It took me to repeat myself several times to pass a satisfactory assembly, yet I am not really new at this ...
A protective film to be affixed on the iPad screen; I have not used, I therefore can not comment on the ease of installation of this film,
A stylus.
In summary, for less than 15 EUR, I have a bag which appears more robust than the original sold EUR 50 and offers additional accessories. The magnetic system that turns on or off the camera when opening or closing the cover works perfectly.
Only remains to see how the product behaves in duration! but it could hardly be worse than the original :-)