I am in such awe of these dials; all three are such amazing specimens. I'm not sure why, but I've always been drawn the most to Bill's dial variant. I refer to that style as "The Double R" because of two minor imperfections with the printing cliché.
1) The bottom right of the "R" in GMT-MASTER seems to have a little pinch near the tip, sometimes making the tip appear square.
2) The bottom right of the "R" in CERTIFIED has a tiny vertical line that extends below.
Therefore, it earned the Double R title, at least in my head.
Other differences that stand out are a cleaner and/or less bold "ROLEX" and "OYSTER PERPETUAL" text. Similarly, the SCOC text has less pronounced serifs making it appear thinner when compared the other variant(s). Finally, the SWISS>T25 is not as bold. I certainly love both styles, but under a microscope, and for no specific reason, I find the Double R type more visually appealing. Could only find the blurry picture below for Exhibit A; sorry for the poor example.
And after all this time, I never realized the dial with larger serifs has SWISS>T25 spread across only three hashes. Would love to see some more macro photos of these dials. I consider them amazing pieces of art.