I have one that I received as "Black Mission" from a F4F member in trade that turned out to be White (green or light). I was not sure what to called it so for my own records I call is "White Mission Unk" instead of the practice "Black.Mission-not" that other would have used. I have not shared it with anyone else to avoid confusion.
But I am glade I got this mis-labelled one because it is a keeper for me.