Watches
Omega Speedmaster Moonwatch Co-Axial Master Chronometer Review: Hesalite vs Sapphire
By NorwegianSpark Editorial — written with AI assistance and reviewed by the NorwegianSpark SA editorial team | Last updated: 2026-08-23
Hesalite vs. Sapphire Sandwich: Which Moonwatch Should You Buy?
The fundamental decision for Moonwatch collectors centers on the crystal material. Hesalite is the exact thermoplastic crystal tested by NASA in 1965 because it does not shatter into hazardous microscopic shards in zero-gravity cabin environments. Sapphire crystal, while not space-qualified, offers impervious scratch resistance and a clear view of the movement.
Compare the Moonwatch chronograph with the Submariner dive watch standard. Start with comparing with iconic sports watches like the Rolex Submariner.
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Where to Buy
Frequently Asked Questions
Does the manual-wind Speedmaster 3861 have hacking seconds?
Yes. Calibre 3861 introduced a hacking seconds stop mechanism, allowing precise time synchronization to the exact second when pulling the crown.
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