It only takes 25 turns of the crown to obtain a 100% charge of the chronograph barrel. So you rotate the crown clockwise for the chronograph and counterclockwise for the time function of the watch. Yet the manual winding works in both directions as you need to power both barrels seperately. One for winding and the other for time-setting as usual. The new-generation twin-barrel El Primero with double barrel has a crown that functions in two positions. Going down from 278 to 203 components while going up only 2mm in width and just over one mm in thichness. With all changes to the movement it’s gone up in size and precision yet it has less parts compared to the 1969 El Primero movement. For the the chronograph the watch comes with a power reserve indicator for the chronograph at 12 o’clock. Doing this should guarantee max precision for the time and using the chronograph function. To accomplish this they came up with a new architecture for the movement with two independent gear boxes and two barrels. Something we’ve seen from Tag Heuer in the past has now been incorporated into the Zenith Defy. The Defy measures up to 1/100th of a second. Where the original El Primero was precise up to 1/10th of a second. Being an acknowledged champion of high-frequency chronoraphs Zenith steps up with the Defy El Primero 21 taking it from 10th to 100th of a second. Ever since the launch of the El Primero movement in 1969, Zenith has broken an incredible amount of chronometry prizes.
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