Head-to-Head Comparison

Updated September 5, 2026

Tudor Black Bay 58 vs Casio MRW-230H

Tudor's diver meets Casio's timepiece

Quick Verdict

The Casio MRW-230H (Under $50) delivers Casio Quartz (Battery) technology in the tier below the Tudor Black Bay 58 ($2,500–$5,000). The MRW-230H measures 44.6mm (47.9 x 44.6 x 12.3mm) and is rated 100m (10 ATM). The Black Bay 58 justifies its premium with Swiss Made heritage and Automatic Manufacture Calibre MT5402. Both represent excellent choices in the luxury watch category.

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Tudor

Black Bay 58

$2,500–$5,000

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Casio

MRW-230H

Under $50

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Specifications Compared

Feature	Tudor Black Bay 58	Casio MRW-230H
Price	$2,500–$5,000	Under $50
Case Size	39mm	44.6mm (47.9 x 44.6 x 12.3mm)
Movement	Automatic Manufacture Calibre MT5402	Quartz
Caliber Type	In-House Automatic Manufacture (Kenissi)	Casio Quartz (Battery)
Power Reserve	70 Hours	Approx. 3-year battery (SR626SW)
Water Resistance	200m (20 ATM)	100m (10 ATM)
Crystal	Domed Sapphire	Resin Glass
Case Material	316L Stainless Steel	Resin case, aluminum bezel ring
Origin	Swiss Made	Casio (Japan)

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Tudor's design language vs Casio's approach

The Tudor Black Bay 58 features a 316L Stainless Steel case at 39mm with Domed Sapphire protection. The Casio MRW-230H offers Resin case, aluminum bezel ring construction at 44.6mm (47.9 x 44.6 x 12.3mm) with Resin Glass. Both represent their brand's distinct design philosophy and heritage.

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Movement & Performance

Edge: Casio

Automatic Manufacture Calibre MT5402 vs Quartz

The Black Bay 58 runs the Automatic Manufacture Calibre MT5402 (In-House Automatic Manufacture (Kenissi), 70 Hours power reserve) at 28,800 vph (4 Hz) frequency. The MRW-230H uses the Quartz (Casio Quartz (Battery), Approx. 3-year battery (SR626SW) reserve) at standard. The MRW-230H offers a longer power reserve.

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Wearability & Fit

Edge: Tudor

39mm vs 44.6mm (47.9 x 44.6 x 12.3mm) — different wrist presence

At 39mm, the Black Bay 58 wears more compactly on smaller wrists compared to the MRW-230H at 44.6mm (47.9 x 44.6 x 12.3mm). Water resistance differs: 200m (20 ATM) vs 100m (10 ATM).

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Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Tudor Black Bay 58 sits at $2,500–$5,000 and the Casio MRW-230H at Under $50. On the specs that outlast any price: the Black Bay 58 uses Domed Sapphire with 70 Hours, against Resin Glass and Approx. 3-year battery (SR626SW) on the MRW-230H. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Tudor

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

The Black Bay 58 is rated to 200m (20 ATM) while the MRW-230H handles 100m (10 ATM). The Black Bay 58 is better suited for water activities.

Our Verdict

Tudor

Black Bay 58

Choose the Tudor Black Bay 58 if you prioritize In-House Automatic Manufacture (Kenissi) engineering, Swiss Made craftsmanship, and 200m (20 ATM) water resistance. At $2,500–$5,000, it delivers Automatic Manufacture Calibre MT5402 with 70 Hours power reserve.

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Casio

MRW-230H

Choose the Casio MRW-230H if you value Casio Quartz (Battery) technology, Casio (Japan) heritage, and 44.6mm (47.9 x 44.6 x 12.3mm) proportions. At Under $50, the Quartz with Approx. 3-year battery (SR626SW) power reserve makes it a compelling choice.

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The Bottom Line

The Tudor Black Bay 58 and Casio MRW-230H represent two distinct approaches to fine watchmaking — the Tudor bringing Swiss Made tradition while Casio delivers Casio (Japan) engineering.

Frequently Asked Questions

The Tudor Black Bay 58 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 Tudor Black Bay 58 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 $2,500–$5,000), 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 Tudor Black Bay 58 may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Black Bay 58 at 39mm with 200m (20 ATM) water resistance handles everyday situations. The MRW-230H at 44.6mm (47.9 x 44.6 x 12.3mm) with 100m (10 ATM) is similarly capable. The Black Bay 58 uses Domed Sapphire while the MRW-230H uses Resin Glass.

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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.