To determine the precision of the mechanical chronograph watches is hunting frequency of the balance wheel. For example, there are 3600 seconds in one hour, if the balance wheel swinging 18000 times per hour, that can divided each second into five, so that can calculate the accuracy of 1/5 of a second. The balance wheel twice fast to 36,000 times, that the precision will be improved to 1/10 of a second.
Zenith replica watches launched the El Primero movement in 1969, which is the first timer movement of delicate replica Zenith with the high frequency of 36000 per hour and also can measure the timing accuracy of 1/10th of a second.
And the replica Zenith Stratos Flyback added the fly back function, which means the fake watches can start another timer when pressing the reset button. And among this series, the balck bezel fake Zenith Stratos Flyback Striking 10th watches even adopted a set of special silicon gear, letting the timer second hand rotate in a high speed in 10 seconds.