mechanical watches use a weird vibrations per hour. so instead of 4hz you get an unintuitive but impressive 28,800vph https://en.m.wikipedia.org/wiki/Vibration

mechanical watches use a weird vibrations per hour. so instead of 4hz you get an unintuitive but impressive 28,800vph https://en.m.wikipedia.org/wiki/Vibrations_per_hour https://en.m.wikipedia.org/wiki/Vibrations_per_hour