Mine is original and it's black, too. The interior was originally painted that beige sort of color.
I'm not sure what other color they painted steering wheels in 1949 but I think some were white and maybe other colors.
If your steering wheel was originally black, your horn button would be also. Any evidence on the wheel of another color? What color is the exterior.
You can usually find the original dash color behind the radio speaker grill. Someone painted my interior black but the original beige is under the grill.
