Hi Doug
There are several dials. White (steel), opaline (gold), black (steel and gold), and some specials. The "old" version Ref. 2763 is 38mm and the new Ref. 2863 is 40mm.
As far as I know there is/was no grey dial, but blue dials you can find with white gold cases ...
Here we go with some special dials:

oliver