Angola 2012 - Unknown copper-colour set

My friend Wolfgang Schuster sent me this image of a different set from Angola 2012. Discussion is open, as we don't know whether they are real circulating ones, trials, or just fakes. Even could be a normal set that someone has electroplated with copper:



(images from Wolfgang Schuster)

Help needed: If you have also seen them or have any further information, please post a comment!!