Head-to-Head Comparison

Updated September 5, 2026

Casio MRW-230H vs Ulysse Nardin Executive Skeleton Tourbillon 45mm (titanium)

Two timepieces compared — Under $50 vs $25,000+

Quick Verdict

The Casio MRW-230H (Under $50) offers Casio Quartz (Battery) precision in the tier below the Ulysse Nardin Executive Skeleton Tourbillon 45mm (titanium) ($25,000+). The MRW-230H measures 44.6mm (47.9 x 44.6 x 12.3mm) and is rated 100m (10 ATM). The Executive Skeleton Tourbillon 45mm (titanium) counters with Swiss Made craftsmanship and 30m (3 ATM) water resistance. Both are exceptional timepieces for their respective tiers.

CasioMRW-230HUnder $50 Check price Ulysse NardinExecutive Skeleton Tourbillon 45mm (titanium)$25,000+ Check price

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Casio

MRW-230H

Under $50

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Ulysse Nardin

Executive Skeleton Tourbillon 45mm (titanium)

$25,000+

Check Price Full Review

Specifications Compared

Feature	Casio MRW-230H	Ulysse Nardin Executive Skeleton Tourbillon 45mm (titanium)
Price	Under $50	$25,000+
Case Size	44.6mm (47.9 x 44.6 x 12.3mm)	45mm
Movement	Quartz	Hand-wound, Ulysse Nardin UN-171 flying tourbillon
Caliber Type	Casio Quartz (Battery)	UN-171, hand-wound, silicon escapement
Power Reserve	Approx. 3-year battery (SR626SW)	About 170 hours (seven days)
Water Resistance	100m (10 ATM)	30m (3 ATM)
Crystal	Resin Glass	Sapphire Crystal, sapphire caseback
Case Material	Resin case, aluminum bezel ring	Titanium, black ceramic 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 Executive Skeleton Tourbillon 45mm (titanium) offers Titanium, black ceramic bezel construction at 45mm with Sapphire Crystal, sapphire caseback. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Ulysse Nardin

Quartz vs Hand-wound, Ulysse Nardin UN-171 flying tourbillon

The MRW-230H runs the Quartz (Casio Quartz (Battery), Approx. 3-year battery (SR626SW) power reserve) at standard frequency. The Executive Skeleton Tourbillon 45mm (titanium) uses the Hand-wound, Ulysse Nardin UN-171 flying tourbillon (UN-171, hand-wound, silicon escapement, About 170 hours (seven days) reserve) at standard. The Executive Skeleton Tourbillon 45mm (titanium) offers a longer power reserve.

📏

Wearability & Fit

Edge: Casio

44.6mm (47.9 x 44.6 x 12.3mm) vs 45mm — different wrist presence

At 44.6mm (47.9 x 44.6 x 12.3mm), the MRW-230H wears more compactly on smaller wrists compared to the Executive Skeleton Tourbillon 45mm (titanium) at 45mm. Water resistance differs: 100m (10 ATM) vs 30m (3 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 Executive Skeleton Tourbillon 45mm (titanium) 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 170 hours (seven days) on the Executive Skeleton Tourbillon 45mm (titanium). Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Casio

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

The MRW-230H is rated to 100m (10 ATM) while the Executive Skeleton Tourbillon 45mm (titanium) handles 30m (3 ATM). The MRW-230H is better suited for water activities.

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

Executive Skeleton Tourbillon 45mm (titanium)

Choose the Ulysse Nardin Executive Skeleton Tourbillon 45mm (titanium) if you value UN-171, hand-wound, silicon escapement technology, Swiss Made heritage, and 45mm proportions. At $25,000+, the Hand-wound, Ulysse Nardin UN-171 flying tourbillon with About 170 hours (seven days) power reserve makes it a compelling choice.

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The Bottom Line

The Casio MRW-230H and Ulysse Nardin Executive Skeleton Tourbillon 45mm (titanium) represent two distinct approaches to the timepiece category — the Casio bringing Casio (Japan) tradition while Ulysse Nardin delivers Swiss Made engineering.

Frequently Asked Questions

The Ulysse Nardin Executive Skeleton Tourbillon 45mm (titanium) 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 Casio MRW-230H 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 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 Executive Skeleton Tourbillon 45mm (titanium) 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 Executive Skeleton Tourbillon 45mm (titanium) at 45mm with 30m (3 ATM) is similarly capable. The MRW-230H uses Resin Glass while the Executive Skeleton Tourbillon 45mm (titanium) 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.