The El Primero 21 features two separate escapements, each with a balance spring made of a new patented material, Carbon-Matrix Carbon Nanotube (say that five times fast). One escapement is just for the time and the other just for the chronograph, with the first running at 36,000 vph and the latter running at 360,000 vph. This means that when the chronograph is in motion, the seconds hand runs around the dial once per second. The seconds are then counted on the 60-second register at six o’clock and the minutes are counted on the 30-minute register at three o’clock. Due to the amount of energy that it takes to run a chronograph at 360,000 vph, the chronograph function can only run for up to 50 minutes, hence the chronograph power reserve at 12 o’clock.
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