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It’s a Speedmaster, and the movement runs at a rate of 3hz, and therefore ticks 6 times per second. Dividing each second into 3 means that the chronograph second hand will fall either on or exactly halfway in between each marking, theoretically allowing a more precise reading (within the limitations of the movement). On the older Speedmasters that were split into 5 (see Condorlini’s) the second hand would only ever fall precisely on the full second.
Regal
Why does that seamaster have 14 lines between each 10 minute marker?