In the 1960s, the Cartier Ballon Bleu Replica Watches made a valiant effort to solve the mystery of how the chronograph became ever more accurate.
Horology is not your usual competitive activity. The Swiss chronometer trials were cancelled at the end of 1960, ending the "Olympics of precision". A recent attempt to revive them in Concours de Chronometrie was hampered by a small number of participants. Although certified accuracy is no longer in fashion, healthy competition seems to be coming in waves in other areas.
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It is thinness that is currently threatening records, but just a few years ago, chronograph frequency was the focus of attention with increasing claims of accuracy.
Frequency is a measure of how well the escapement cuts up time for
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the chronograph seconds hand. Speedmasters with 321 calibers beat at 2.5 Hz. This is equivalent to 0.2 seconds per beat. The calibers of the early 7750 ran at 3 Hz, with each beat being a very awkward 0.167 of an second. The later 7750s and Rolex Daytona's caliber 42130 run at 4 Hz. This allows for a display of 0.125 seconds.