There are a number of holsters evidently used by the Germans for the M14:
1) As shown, brown, two belt loops extending above back of holster
2) Same, but belt loops shortened and offset so that the pistol is canted forward when worn on left side
3) As 2, but with spare mag pouch added
2) and 3) are evidently German modifications of 1)
4) A type in brown leather with single wide belt loop and mag pouch; the type lacks the cylindrical reinforcement of 1,2,3; I think this one is shown in Bender's book, and perhaps in Whittington.
Some of these types are ink-stamped e/WaA84; some have a script N (perhaps = Nordsee?), some are unmarked and there is at least one type 4 with impressed e/M on the back.
So far I have not seen a black version of types 2-4; I think the black type 1s are immediate postwar, but can't be sure of that.