The Watch That Defied Space

The Omega Speedmaster — known the world over as the Moonwatch — is far more than a testament to fine watchmaking. It has become an enduring symbol of humanity’s ambition beyond Earth. To earn its certification as the official timepiece for all crewed NASA missions, this iconic watch had to survive eleven punishing tests that pushed the limits of the era’s technology to their absolute edge.

When NASA scientists first contemplated sending human beings into space, a fundamental question arose: should astronauts wear a wristwatch? Spacecraft were already equipped with electronic timers, but in a critical emergency — where spatial interference might compromise those systems entirely — a mechanical watch would be the only reliable instrument left.

Following an open selection process, NASA determined that any candidate watch would have to meet exacting requirements. Deke Slayton, Director of Flight Crew Operations for the Apollo missions, wrote to the world’s leading watchmakers requesting a high-legibility chronograph. Omega, with its Speedmaster ST 105.003, was the first to respond.

The Eleven Tests the Omega Speedmaster Had to Pass

Without preference for any particular manufacturer, NASA required each candidate watch to pass eleven rigorous tests simulating the harsh conditions of space. They were:

• Low temperature: continuous operation at -18°C for four hours.
• Vacuum resistance: exposure to repeated heating and cooling cycles inside a vacuum chamber.
• Humidity: operation at 95% relative humidity between 25°C and 70°C for 24 hours.
• Corrosion: exposure to a pure oxygen atmosphere at 70°C for 48 hours.
• Shock resistance: six impacts of 40 G across six directions.
• Acceleration: sustained resistance to 7.25 G of progressive acceleration for five minutes.
• Low pressure: testing at 10⁻⁶ atmospheres at 70°C.
• High pressure: exposure to 1.6 atmospheres for 60 minutes.
• Vibration: resistance to random vibrations between 5 and 2,000 Hz.
• Acoustic resistance: sustained exposure to 130 decibels across frequencies between 40 and 10,000 Hz for 30 minutes.

Throughout these punishing trials, Omega required no new developments and no redesigned components. The watch submitted was the same Speedmaster already available in the market. While competing watches failed — most critically in the temperature test — the Speedmaster emerged without a single disqualification.

On March 23, 1965, the Speedmaster ST 105.003 traveled to space for the first time, marking the beginning of an illustrious career. NASA required only a single modification: the addition of a Velcro strap. With that same reference, the first spacewalk was performed — and in 1968, the far side of the Moon was surveyed. Then, on July 20, 1969, the Omega Speedmaster became the first watch to be worn on the lunar surface.

Sixty years on from those defining moments, the Omega Speedmaster remains the standard by which all tool watches are measured — a permanent reminder of an era when humanity pressed into the unknown, marking every second of the journey to the stars.