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Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) vs Zenith Chronomaster El Primero Open Power Reserve (18k rose gold)
Breguet's dress watch meets Zenith's chronograph
Quick Verdict
The Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) ($10,000–$25,000) delivers El Primero 4021, 36,000 vph (5 Hz), column wheel, automatic technology in the tier below the Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) ($25,000+). The Chronomaster El Primero Open Power Reserve (18k rose gold) measures 42mm and is rated 100m (10 ATM). The Classique 7137 Power Reserve Moonphase (18k yellow gold) justifies its premium with Swiss Made heritage and Automatic, Breguet Calibre 502.3 QSE1 (ultra-thin, off-centre rotor). Both represent excellent choices in the luxury watch category.
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Zenith
Chronomaster El Primero Open Power Reserve (18k rose gold)
$10,000–$25,000
Specifications Compared
| Feature | Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) | Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) |
|---|---|---|
| Price | $25,000+ | $10,000–$25,000 |
| Case Size | 39mm | 42mm |
| Movement | Automatic, Breguet Calibre 502.3 QSE1 (ultra-thin, off-centre rotor) | Automatic chronograph, Zenith El Primero 4021 |
| Caliber Type | Breguet 502.3 QSE1, automatic, silicon escapement | El Primero 4021, 36,000 vph (5 Hz), column wheel, automatic |
| Power Reserve | About 45 hours, with indicator | About 50 hours, with indicator |
| Water Resistance | 30m (3 ATM) | 100m (10 ATM) |
| Crystal | Sapphire Crystal, sapphire caseback | Sapphire Crystal, sapphire exhibition caseback |
| Case Material | 18k yellow gold, fluted caseband | 18k rose gold |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Breguet's design language vs Zenith's approach
The Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) features a 18k yellow gold, fluted caseband case at 39mm with Sapphire Crystal, sapphire caseback protection. The Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) offers 18k rose gold construction at 42mm with Sapphire Crystal, sapphire exhibition caseback. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic, Breguet Calibre 502.3 QSE1 (ultra-thin, off-centre rotor) vs Automatic chronograph, Zenith El Primero 4021
The Classique 7137 Power Reserve Moonphase (18k yellow gold) runs the Automatic, Breguet Calibre 502.3 QSE1 (ultra-thin, off-centre rotor) (Breguet 502.3 QSE1, automatic, silicon escapement, About 45 hours, with indicator power reserve) at standard frequency. The Chronomaster El Primero Open Power Reserve (18k rose gold) uses the Automatic chronograph, Zenith El Primero 4021 (El Primero 4021, 36,000 vph (5 Hz), column wheel, automatic, About 50 hours, with indicator reserve) at standard. The Chronomaster El Primero Open Power Reserve (18k rose gold) offers a longer power reserve.
Wearability & Fit
39mm vs 42mm — different wrist presence
At 39mm, the Classique 7137 Power Reserve Moonphase (18k yellow gold) wears more compactly on smaller wrists compared to the Chronomaster El Primero Open Power Reserve (18k rose gold) at 42mm. Water resistance differs: 30m (3 ATM) vs 100m (10 ATM).
Value & Cost of Ownership
Zenith sits in the lower tier
The Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) sits at $25,000+ and the Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) at $10,000–$25,000. On the specs that outlast any price: the Classique 7137 Power Reserve Moonphase (18k yellow gold) uses Sapphire Crystal, sapphire caseback with About 45 hours, with indicator, against Sapphire Crystal, sapphire exhibition caseback and About 50 hours, with indicator on the Chronomaster El Primero Open Power Reserve (18k rose gold). Service intervals are typically 5-7 years for both.
Water Resistance
30m (3 ATM) vs 100m (10 ATM)
The Classique 7137 Power Reserve Moonphase (18k yellow gold) is rated to 30m (3 ATM) while the Chronomaster El Primero Open Power Reserve (18k rose gold) handles 100m (10 ATM). The Chronomaster El Primero Open Power Reserve (18k rose gold) offers superior water resistance.
Our Verdict
Breguet
Classique 7137 Power Reserve Moonphase (18k yellow gold)
Choose the Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) if you prioritize Breguet 502.3 QSE1, automatic, silicon escapement engineering, Swiss Made craftsmanship, and 30m (3 ATM) water resistance. At $25,000+, it delivers Automatic, Breguet Calibre 502.3 QSE1 (ultra-thin, off-centre rotor) with About 45 hours, with indicator power reserve.
Check Price on AmazonZenith
Chronomaster El Primero Open Power Reserve (18k rose gold)
Choose the Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) if you value El Primero 4021, 36,000 vph (5 Hz), column wheel, automatic technology, Swiss Made heritage, and 42mm proportions. At $10,000–$25,000, the Automatic chronograph, Zenith El Primero 4021 with About 50 hours, with indicator power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) and Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) represent two distinct approaches to fine watchmaking — the Breguet bringing Swiss Made tradition while Zenith 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.