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by Ashton Tracy
Vibrations per hour (vph), Hertz (Hz), beats per hour (bph), or train count: no matter what you call it, all watches have it. Well, what is it?
Hertz (Hz) is metric and measured in full cycles per second; vph is traditional and refers to half cycles per hour. To convert Hertz to vph (or vice versa), multiply (or divide by) 7,200: 3,600 (seconds in an hour) x two (half beats).
“Frequency” is most commonly referred to as “vibrations per hour,” though, and refers to how fast the escapement of the watch ticks.
https://quillandpad.com/2020/03/25/fast ... explained/
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