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The Omega Technical Guide of Chronocentric has two discussable statements about the Speedmaster:
"The Hesalite crystal is maintained on that specific model as a safety feature for its use in space flight missions"
"The Speedmaster Moonwatch and X-33 are only water resistant to about 30 meters. Air pressure difference issues occur in routine space mission events, rendering a watch that cannot handle them a danger to the mission."
Why can the Fortis than be: water-resistant to 200 m (20 ATM), sapphire crystal with anti-reflective coating on both sides, screw-down crown, pushers and caseback
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