Well...5004P with black arabic dial is quite common in early 5004 (you can make a search in the 3 auction houses)...
To me, I have a gut feeling that WG may be less than PT, then red gold and yellow...( i could not prove; just the search in the auction house again...but similar observation in 3970 and 5050...the watches at that era...)
For the dial configuration; there are many special ones...I have ever seen the following:
1. 5004P with pulsometer dial;
2. 5004P with baguette diamond index black dial;
2 5004R with red gemstone index pink dial;
3. 5004J with black arabic dial...
So your watch is not rare; but please enjoy it!