... For there is only one truly classic chronograph form factor: round case, rectangular chronograph buttons, subdials at 3 and 9, railroad track seconds and tachy scale on the outside of that (but on the dial), stick hour markers, perhaps alternated with a few (but only a few) sans serif arabic numerals.
AP, GP and PP (alphabetical order of first initial) all understand that perfectly.
My 2c,
Jos.