What was the core reason NASA selected the Omega Speedmaster for spaceflight qualification?

Answer

It was the only watch to survive a series of brutal, objective qualification tests.

The Omega Speedmaster earned its place because it was the sole timepiece among those submitted that successfully passed the rigorous, mission-critical qualification tests conducted by NASA in 1965.

What was the core reason NASA selected the Omega Speedmaster for spaceflight qualification?

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Why NASA chose the Speedmaster - Best explanation you will hear

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