Guys, manual wind Breitlings from the 70's (and probably earlier too) used subdial markings like that too, and nearly all were powered by 7730's, 7736's, and 7740's.
….. but I don't know anything about Breitling really so it's just a guess.
Glad I didn't have to throw more clues out there, like:
I'd tell you the answer, but that wouldn't be cricket.
or
I'm alarmed that no one has figured this out by now.
or
Better known for Truman than Newman.
Hope to have it in hand tomorrow. I'll take it, at 1/500 the price of the average Christie's Lesson One Daytona.... my holiday bonus was obviously smaller than Gavin's.