In our daily newspaper today there is a photo of a demonstration in Montenegro. Prominent in it is a flag that I do not see on the FOTW-ws. It is described as a former flag of Montenegro, and is approx. It is similar to the flag above , but without the N1 monogram, the white edge and is rectangular. When I first saw it, I thought it was the Swiss flag.
Flag have no official status.
Even if it is far from perfect, since it only goes about unofficial flags, whose standardization is far from made, it might not be of much importance.