Longines Master Collection Moonphase vs Mido Ocean Star GMT
Longines's dress watch meets Mido's diver
Quick Verdict
The Mido Ocean Star GMT ($1,000–$1,500) delivers Automatic (ETA C07.661 base) technology in the tier below the Longines Master Collection Moonphase ($2,500–$5,000). The Ocean Star GMT measures 44mm and is rated 200m (20 ATM). The Master Collection Moonphase justifies its premium with Swiss Made heritage and Automatic Caliber L899. Both represent excellent choices in the luxury watch category.
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Specifications Compared
| Feature | Longines Master Collection Moonphase | Mido Ocean Star GMT |
|---|---|---|
| Price | $2,500–$5,000 | $1,000–$1,500 |
| Case Size | 40mm | 44mm |
| Movement | Automatic Caliber L899 | Automatic Caliber 80 (Base ETA C07.661) |
| Caliber Type | Automatic (ETA A31.L91 base) | Automatic (ETA C07.661 base) |
| Power Reserve | 72 Hours | 80 Hours |
| Water Resistance | 30m (3 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Sapphire with Double-sided AR |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Longines's design language vs Mido's approach
The Longines Master Collection Moonphase features a Stainless Steel case at 40mm with Sapphire Crystal protection. The Mido Ocean Star GMT offers Stainless Steel construction at 44mm with Sapphire with Double-sided AR. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber L899 vs Automatic Caliber 80 (Base ETA C07.661)
The Master Collection Moonphase runs the Automatic Caliber L899 (Automatic (ETA A31.L91 base), 72 Hours power reserve) at 25,200 vph (3.5 Hz) frequency. The Ocean Star GMT uses the Automatic Caliber 80 (Base ETA C07.661) (Automatic (ETA C07.661 base), 80 Hours reserve) at 21,600 vph (3 Hz). The Ocean Star GMT offers a longer power reserve.
Wearability & Fit
40mm vs 44mm — different wrist presence
At 40mm, the Master Collection Moonphase wears more compactly on smaller wrists compared to the Ocean Star GMT at 44mm. Water resistance differs: 30m (3 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Mido sits in the lower tier
The Longines Master Collection Moonphase sits at $2,500–$5,000 and the Mido Ocean Star GMT at $1,000–$1,500. On the specs that outlast any price: the Master Collection Moonphase uses Sapphire Crystal with 72 Hours, against Sapphire with Double-sided AR and 80 Hours on the Ocean Star GMT. Service intervals are typically 5-7 years for both.
Water Resistance
30m (3 ATM) vs 200m (20 ATM)
The Master Collection Moonphase is rated to 30m (3 ATM) while the Ocean Star GMT handles 200m (20 ATM). The Ocean Star GMT offers superior water resistance.
Materials Face-Off
| Component | Longines Master Collection Moonphase | Mido Ocean Star GMT |
|---|---|---|
| Case alloy | Stainless steel 316L (standard mid-range Swiss spec). | Stainless steel 316L |
| Crystal | Synthetic sapphire grown via Verneuil process, Mohs 9, anti-reflective coating on interior. Mohs 9 | Synthetic sapphire grown via Verneuil process, Mohs 9. Double-sided AR coating — uncommon at this price tier, provides exceptionally clear dial readi Mohs 9 |
| Lume specification | None (dress watch by design). | Ceramic (ZrO₂) — scratchproof, color-stable. Engraved 24-hour scale |
| Dial finishing | Barleycorn guilloché — fine textured pattern resembling barley seed heads, machine-engraved or stamped into the dial brass disc. One of horology's cl | Super-LumiNova (variant-dependent grade) |
| Hand finishing | Blued steel via thermal treatment (heat-blued) or chemical bluing process. | Stainless steel 316L |
Cost of Ownership Compared
The Mido Ocean Star GMT saves you $1,494 over 5 years of ownership
Who Should Pick Which
Pick the Longines Master Collection Moonphase if…
- Weekend warriors — 72-hour power reserve means it survives two days off the wrist
- Those who prioritize scratch resistance — sapphire crystal
- Dress watch seekers who want understated elegance
Pick the Mido Ocean Star GMT if…
- Enthusiasts wanting proven Swiss/Japanese quality in the $1,000–$2,000 sweet spot
- Dive watch enthusiasts — 200m water resistance is proper dive spec
- Weekend warriors — 80-hour power reserve means it survives two days off the wrist
- Those who prioritize scratch resistance — sapphire crystal
- Dive watch collectors who appreciate proper ISO-rated tool watches
Longines Master Collection Moonphase
- ETA A31 base at this price — though Longines-exclusive, the architecture is shared platform. Some buyers expect in-house at this price.
- 30m water resistance — strictly dress watch use; no swimming, no shower
- Moonphase indication is rough — like most "simple" moonphase movements, the 29.5-day approximation is imprecise vs. actual 29.53-day lunar cycle (requires ~1-day adjustment every 2.5 years)
- 3.5 Hz frequency is unusual — not as smooth as 4 Hz peers
Mido Ocean Star GMT
- 44mm wears large — too big for under-7" wrists
- ETA base movement at this price — fair value but not in-house prestige
- Crystal AR coating can show fingerprints — double-sided AR is a quality upgrade but requires more frequent wipe-downs
- Bracelet quality is adequate not exceptional — most owners report the bracelet is the watch's weak point; aftermarket rubber/MN straps significantly upgrade daily wear
Our Verdict
Longines
Master Collection Moonphase
Choose the Longines Master Collection Moonphase if you prioritize Automatic (ETA A31.L91 base) engineering, Swiss Made craftsmanship, and 30m (3 ATM) water resistance. At $2,500–$5,000, it delivers Automatic Caliber L899 with 72 Hours power reserve.
Check Price on AmazonMido
Ocean Star GMT
Choose the Mido Ocean Star GMT if you value Automatic (ETA C07.661 base) technology, Swiss Made heritage, and 44mm proportions. At $1,000–$1,500, the Automatic Caliber 80 (Base ETA C07.661) with 80 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Longines Master Collection Moonphase and Mido Ocean Star GMT represent two distinct approaches to fine watchmaking — the Longines bringing Swiss Made tradition while Mido delivers Swiss Made engineering.
Frequently Asked Questions
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How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.