Developed in 1962, American astronaut Scott Carpenter on the Mercury-Atlas 7 project wore a Navitimer Cosmonaute (Reference 809) aboard the Aurora 7 spacecraft as he orbited the earth three times.
As an aviator, the circular slide rule is the defining tool on the dial to calculate speed/distance. The 24 hour is also an important feature of this timepiece, whilst on Earth it is easy to determine if it is 2 pm or 2 am. This is understandably difficult to detect in space as it is difficult to determine day or night.
In the case of NASA, the launch is at Cape Canaveral and Mission Control is in Houston so when you are orbiting the Earth it might be a little difficult to determine the Houston time zone when you are over Africa - fair cop.
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