The cover is a brown black, or soft black, when compared to something like a cold black of a Canon F-1. The covering is nice and soft feeling and in great shape. My guess is that it has been replaced at some time.
That's what nearly 70 years ageing does to the original covering, mines the same despite a being a camera that;s had heavy use. The covereing on all my early cameras is like that, Kodak, Leica, Zeiss,KW, Orion Werks, Rodenstock, Exacta etc - and all in surprisingly good condition.