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I'm not sure Omega has explicitly indicated the reason . . .

 

. . . for dividing seconds into thirds, but Google search brings up several commentaries from watch media outlets confirming the rationale of matching beats to tick marks.  

First generation Speedmaster dials are segmented into fifths, corresponding to the 2.5 Hz resonant frequency of cal 321.  Zenith El Primero movements are also segmented into fifths, with each hash mark covering two beats.

The 2009 Speedy Split movement . . .




. . . is based on a Piquet ébauche that beats at 4 Hz.  The hash marks correspond to four pairs of beats per second.


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