Head-to-Head Comparison

Updated September 5, 2026

Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) vs Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial)

Breguet's dress watch meets Rolex's timepiece

Quick Verdict

The Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) ($10,000–$25,000) delivers Rolex 2235, chronometer certified technology in the tier below the Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) ($25,000+). The Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) measures 26mm 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.

BreguetClassique 7137 Power Reserve Moonphase (18k yellow gold)$25,000+ Check price RolexLady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial)$10,000–$25,000 Check price

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Breguet

Classique 7137 Power Reserve Moonphase (18k yellow gold)

$25,000+

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Rolex

Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial)

$10,000–$25,000

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Specifications Compared

Feature	Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold)	Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial)
Price	$25,000+	$10,000–$25,000
Case Size	39mm	26mm
Movement	Automatic, Breguet Calibre 502.3 QSE1 (ultra-thin, off-centre rotor)	Automatic, Rolex calibre 2235, quickset date
Caliber Type	Breguet 502.3 QSE1, automatic, silicon escapement	Rolex 2235, chronometer certified
Power Reserve	About 45 hours, with indicator	About 42 hours
Water Resistance	30m (3 ATM)	100m (10 ATM)
Crystal	Sapphire Crystal, sapphire caseback	Sapphire Crystal, Cyclops
Case Material	18k yellow gold, fluted caseband	Oystersteel with 18k white gold fluted bezel (white Rolesor)
Origin	Swiss Made	Swiss Made

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Breguet's design language vs Rolex'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 Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) offers Oystersteel with 18k white gold fluted bezel (white Rolesor) construction at 26mm with Sapphire Crystal, Cyclops. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Breguet

Automatic, Breguet Calibre 502.3 QSE1 (ultra-thin, off-centre rotor) vs Automatic, Rolex calibre 2235, quickset date

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 Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) uses the Automatic, Rolex calibre 2235, quickset date (Rolex 2235, chronometer certified, About 42 hours reserve) at standard. The Classique 7137 Power Reserve Moonphase (18k yellow gold) edges ahead on power reserve.

📏

Wearability & Fit

Edge: Rolex

39mm vs 26mm — different wrist presence

At 39mm, the Classique 7137 Power Reserve Moonphase (18k yellow gold) has a bolder wrist presence compared to the Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) at 26mm. Water resistance differs: 30m (3 ATM) vs 100m (10 ATM).

💰

Value & Cost of Ownership

Edge: Rolex

Rolex sits in the lower tier

The Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) sits at $25,000+ and the Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) 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, Cyclops and About 42 hours on the Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial). Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Rolex

30m (3 ATM) vs 100m (10 ATM)

The Classique 7137 Power Reserve Moonphase (18k yellow gold) is rated to 30m (3 ATM) while the Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) handles 100m (10 ATM). The Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) 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.

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Rolex

Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial)

Choose the Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) if you value Rolex 2235, chronometer certified technology, Swiss Made heritage, and 26mm proportions. At $10,000–$25,000, the Automatic, Rolex calibre 2235, quickset date with About 42 hours power reserve makes it a compelling choice.

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The Bottom Line

The Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) and Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) represent two distinct approaches to fine watchmaking — the Breguet bringing Swiss Made tradition while Rolex delivers Swiss Made engineering.

Frequently Asked Questions

For water, the Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) is rated 100 m against 30 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) sits a band lower ($10,000–$25,000 against $25,000+), so it is the cheaper way into the category. Neither is better at everything; the spec table above shows movement, case size, water resistance and crystal side by side so you can weigh what matters to you. We do not test units, so this is the makers' data, not a bench result.

The Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) offers better upfront value, sitting a tier lower at $10,000–$25,000. However, the Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Classique 7137 Power Reserve Moonphase (18k yellow gold) at 39mm with 30m (3 ATM) water resistance handles everyday situations. The Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) at 26mm with 100m (10 ATM) is similarly capable. The Classique 7137 Power Reserve Moonphase (18k yellow gold) uses Sapphire Crystal, sapphire caseback while the Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) uses Sapphire Crystal, Cyclops.

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Breguet Classique 7137 Power Reserve Moonphase (18k yellow gold) — Full Review Rolex Lady-Datejust 26 79174 (steel, white gold fluted bezel, sodalite diamond dial) — Full Review Browse All Guides

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.