Unfortunately I strongly suspect Dennis is right. Black dials on these models and from this era in general are extremely rare, most were either silver, champagne or occasionally white.
Another couple other points that makes me suspicious:
The Swiss made text is far too close to the minute track
What look like little pin pricks on the sub dial, I suspect these could have be made when the whoever did the redial was working out the spacing of the seconds track.
As long as you like the watch, which you clearly do, a redial only really affects value of the piece, don't let it spoil your enjoyment.
Cheers,
Gary