Head-to-Head Comparison

Updated September 5, 2026

Casio MRW-230H vs Longines HydroConquest Automatic

Casio's timepiece meets Longines's diver

Quick Verdict

The Casio MRW-230H (Under $50) offers Casio Quartz (Battery) precision in the tier below the Longines HydroConquest Automatic ($1,500–$2,500). The MRW-230H measures 44.6mm (47.9 x 44.6 x 12.3mm) and is rated 100m (10 ATM). The HydroConquest Automatic counters with Swiss Made craftsmanship and 300m (30 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioMRW-230HUnder $50 Check price LonginesHydroConquest Automatic$1,500–$2,500 Check price

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Casio

MRW-230H

Under $50

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Longines

HydroConquest Automatic

$1,500–$2,500

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Specifications Compared

Feature	Casio MRW-230H	Longines HydroConquest Automatic
Price	Under $50	$1,500–$2,500
Case Size	44.6mm (47.9 x 44.6 x 12.3mm)	41mm
Movement	Quartz	Automatic L888.5
Caliber Type	Casio Quartz (Battery)	ETA-Based Automatic with Silicon Balance Spring
Power Reserve	Approx. 3-year battery (SR626SW)	72 Hours
Water Resistance	100m (10 ATM)	300m (30 ATM)
Crystal	Resin Glass	Sapphire with Anti-Reflective Coating
Case Material	Resin case, aluminum bezel ring	Stainless Steel
Origin	Casio (Japan)	Swiss Made

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Casio's design language vs Longines'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 Longines HydroConquest Automatic offers Stainless Steel construction at 41mm with Sapphire with Anti-Reflective Coating. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Longines

Quartz vs Automatic L888.5

The MRW-230H runs the Quartz (Casio Quartz (Battery), Approx. 3-year battery (SR626SW) power reserve) at standard frequency. The HydroConquest Automatic uses the Automatic L888.5 (ETA-Based Automatic with Silicon Balance Spring, 72 Hours reserve) at 25,200 vph (3.5 Hz). The HydroConquest Automatic offers a longer power reserve.

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Wearability & Fit

Edge: Longines

44.6mm (47.9 x 44.6 x 12.3mm) vs 41mm — 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 HydroConquest Automatic at 41mm. Water resistance differs: 100m (10 ATM) vs 300m (30 ATM).

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Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio MRW-230H sits at Under $50 and the Longines HydroConquest Automatic at $1,500–$2,500. On the specs that outlast any price: the MRW-230H uses Resin Glass with Approx. 3-year battery (SR626SW), against Sapphire with Anti-Reflective Coating and 72 Hours on the HydroConquest Automatic. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Longines

100m (10 ATM) vs 300m (30 ATM)

The MRW-230H is rated to 100m (10 ATM) while the HydroConquest Automatic handles 300m (30 ATM). The HydroConquest Automatic 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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Longines

HydroConquest Automatic

Choose the Longines HydroConquest Automatic if you value ETA-Based Automatic with Silicon Balance Spring technology, Swiss Made heritage, and 41mm proportions. At $1,500–$2,500, the Automatic L888.5 with 72 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Casio MRW-230H and Longines HydroConquest Automatic represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Longines delivers Swiss Made engineering.

Frequently Asked Questions

The Longines HydroConquest Automatic 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 Longines HydroConquest Automatic is rated 300 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 $1,500–$2,500), 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 Longines HydroConquest Automatic 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 HydroConquest Automatic at 41mm with 300m (30 ATM) is similarly capable. The MRW-230H uses Resin Glass while the HydroConquest Automatic uses Sapphire with Anti-Reflective Coating.

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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.