Head-to-Head Comparison

Updated September 5, 2026

Casio MRW-230H vs Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold)

Casio's timepiece meets Ulysse Nardin's chronograph

Quick Verdict

The Casio MRW-230H (Under $50) offers Casio Quartz (Battery) precision in the tier below the Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold) ($25,000+). The MRW-230H measures 44.6mm (47.9 x 44.6 x 12.3mm) and is rated 100m (10 ATM). The Marine Chronometer Manufacture 43mm (18k rose gold) counters with Swiss Made craftsmanship and 200m (20 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioMRW-230HUnder $50 Check price Ulysse NardinMarine Chronometer Manufacture 43mm (18k rose gold)$25,000+ Check price

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Casio

MRW-230H

Under $50

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Ulysse Nardin

Marine Chronometer Manufacture 43mm (18k rose gold)

$25,000+

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Specifications Compared

Feature	Casio MRW-230H	Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold)
Price	Under $50	$25,000+
Case Size	44.6mm (47.9 x 44.6 x 12.3mm)	43mm
Movement	Quartz	Automatic, Ulysse Nardin UN-118 (in-house)
Caliber Type	Casio Quartz (Battery)	UN-118, DIAMonSIL escapement, silicon balance spring, COSC-certified
Power Reserve	Approx. 3-year battery (SR626SW)	About 60 hours, indicator at 12
Water Resistance	100m (10 ATM)	200m (20 ATM)
Crystal	Resin Glass	Sapphire Crystal, sapphire caseback
Case Material	Resin case, aluminum bezel ring	18k rose gold, fluted bezel
Origin	Casio (Japan)	Swiss Made

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Ulysse Nardin's approach

The Casio MRW-230H features a Resin case, aluminum bezel ring case at 44.6mm (47.9 x 44.6 x 12.3mm) with Resin Glass protection. The Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold) offers 18k rose gold, fluted bezel construction at 43mm with Sapphire Crystal, sapphire caseback. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Ulysse Nardin

Quartz vs Automatic, Ulysse Nardin UN-118 (in-house)

The MRW-230H runs the Quartz (Casio Quartz (Battery), Approx. 3-year battery (SR626SW) power reserve) at standard frequency. The Marine Chronometer Manufacture 43mm (18k rose gold) uses the Automatic, Ulysse Nardin UN-118 (in-house) (UN-118, DIAMonSIL escapement, silicon balance spring, COSC-certified, About 60 hours, indicator at 12 reserve) at standard. The Marine Chronometer Manufacture 43mm (18k rose gold) offers a longer power reserve.

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Wearability & Fit

Edge: Ulysse Nardin

44.6mm (47.9 x 44.6 x 12.3mm) vs 43mm — different wrist presence

At 44.6mm (47.9 x 44.6 x 12.3mm), the MRW-230H has a bolder wrist presence compared to the Marine Chronometer Manufacture 43mm (18k rose gold) at 43mm. Water resistance differs: 100m (10 ATM) vs 200m (20 ATM).

💰

Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio MRW-230H sits at Under $50 and the Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold) at $25,000+. On the specs that outlast any price: the MRW-230H uses Resin Glass with Approx. 3-year battery (SR626SW), against Sapphire Crystal, sapphire caseback and About 60 hours, indicator at 12 on the Marine Chronometer Manufacture 43mm (18k rose gold). Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Ulysse Nardin

100m (10 ATM) vs 200m (20 ATM)

The MRW-230H is rated to 100m (10 ATM) while the Marine Chronometer Manufacture 43mm (18k rose gold) handles 200m (20 ATM). The Marine Chronometer Manufacture 43mm (18k rose gold) offers superior water resistance.

Our Verdict

Casio

MRW-230H

Choose the Casio MRW-230H if you prioritize Casio Quartz (Battery) engineering, Casio (Japan) craftsmanship, and 100m (10 ATM) water resistance. At Under $50, it delivers Quartz with Approx. 3-year battery (SR626SW) power reserve.

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Ulysse Nardin

Marine Chronometer Manufacture 43mm (18k rose gold)

Choose the Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold) if you value UN-118, DIAMonSIL escapement, silicon balance spring, COSC-certified technology, Swiss Made heritage, and 43mm proportions. At $25,000+, the Automatic, Ulysse Nardin UN-118 (in-house) with About 60 hours, indicator at 12 power reserve makes it a compelling choice.

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The Bottom Line

The Casio MRW-230H and Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold) represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Ulysse Nardin delivers Swiss Made engineering.

Frequently Asked Questions

The Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold) is the better buy if you want a mechanical movement; the Casio MRW-230H is the better buy if you want quartz accuracy with no servicing. For water, the Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold) is rated 200 m against 100 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Casio MRW-230H sits a band lower (Under $50 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 Casio MRW-230H offers better upfront value, sitting a tier lower at Under $50. However, the Ulysse Nardin Marine Chronometer Manufacture 43mm (18k rose gold) may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The MRW-230H at 44.6mm (47.9 x 44.6 x 12.3mm) with 100m (10 ATM) water resistance handles everyday situations. The Marine Chronometer Manufacture 43mm (18k rose gold) at 43mm with 200m (20 ATM) is similarly capable. The MRW-230H uses Resin Glass while the Marine Chronometer Manufacture 43mm (18k rose gold) uses Sapphire Crystal, sapphire caseback.

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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.