In addition, on September 29, 1964, NASA ordered two Speedmaster models for the second - even tougher - test series. In addition to the caliber 321 - the construction was designed by Albert Piguet in 1946 - the Rolex competes with the Valjoux 72, while the Longines uses the caliber 13 ZN. The upcoming tests are tough: In addition to high temperature tests of up to almost 100 degrees Celsius, the watches are also facing frosty hours, down to minus 18 degrees, as well as various tests at fluctuating air pressure and different humidity. The shock tests in which the watches were exposed to up to 40 G are particularly tough. The clocks have to withstand six of these beats with a duration of 11 milliseconds each, as well as a linear acceleration from one to 7.25 G within 333 seconds - a typical launch situation for a moon rocket. The vibration behavior as well as the reaction to acoustic loads was tested. The threereplica Rolex datejust watches final chronographs are exposed to sound at up to 10,000 hertz.
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