Head-to-Head Comparison

Updated September 5, 2026

Casio MRW-230H vs Frederique Constant Slimline Moonphase Manufacture

Casio's timepiece meets Frederique Constant's dress watch

Quick Verdict

The Casio MRW-230H (Under $50) offers Casio Quartz (Battery) precision in the tier below the Frederique Constant Slimline Moonphase Manufacture ($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 Slimline Moonphase Manufacture counters with Swiss Made craftsmanship and 30m (3 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioMRW-230HUnder $50 Check price View the dossier

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Casio

MRW-230H

Under $50

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Frederique Constant

Slimline Moonphase Manufacture

$2,500–$5,000

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Specifications Compared

Feature	Casio MRW-230H	Frederique Constant Slimline Moonphase Manufacture
Price	Under $50	$2,500–$5,000
Case Size	44.6mm (47.9 x 44.6 x 12.3mm)	42mm
Movement	Quartz	Automatic FC-705 (In-House)
Caliber Type	Casio Quartz (Battery)	In-House Automatic Manufacture
Power Reserve	Approx. 3-year battery (SR626SW)	42 Hours
Water Resistance	100m (10 ATM)	30m (3 ATM)
Crystal	Resin Glass	Convex Sapphire
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 Frederique Constant'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 Frederique Constant Slimline Moonphase Manufacture offers Stainless Steel construction at 42mm with Convex Sapphire. Both represent their brand's distinct design philosophy and heritage.

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Movement & Performance

Edge: Frederique Constant

Quartz vs Automatic FC-705 (In-House)

The MRW-230H runs the Quartz (Casio Quartz (Battery), Approx. 3-year battery (SR626SW) power reserve) at standard frequency. The Slimline Moonphase Manufacture uses the Automatic FC-705 (In-House) (In-House Automatic Manufacture, 42 Hours reserve) at 28,800 vph (4 Hz). The Slimline Moonphase Manufacture offers a longer power reserve.

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Wearability & Fit

Edge: Frederique Constant

44.6mm (47.9 x 44.6 x 12.3mm) vs 42mm — 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 Slimline Moonphase Manufacture at 42mm. Water resistance differs: 100m (10 ATM) vs 30m (3 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 Frederique Constant Slimline Moonphase Manufacture at $2,500–$5,000. On the specs that outlast any price: the MRW-230H uses Resin Glass with Approx. 3-year battery (SR626SW), against Convex Sapphire and 42 Hours on the Slimline Moonphase Manufacture. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Casio

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

The MRW-230H is rated to 100m (10 ATM) while the Slimline Moonphase Manufacture 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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Frederique Constant

Slimline Moonphase Manufacture

Choose the Frederique Constant Slimline Moonphase Manufacture if you value In-House Automatic Manufacture technology, Swiss Made heritage, and 42mm proportions. At $2,500–$5,000, the Automatic FC-705 (In-House) with 42 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Casio MRW-230H and Frederique Constant Slimline Moonphase Manufacture represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Frederique Constant delivers Swiss Made engineering.

Frequently Asked Questions

The Frederique Constant Slimline Moonphase Manufacture 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 $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 Frederique Constant Slimline Moonphase Manufacture 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 Slimline Moonphase Manufacture at 42mm with 30m (3 ATM) is similarly capable. The MRW-230H uses Resin Glass while the Slimline Moonphase Manufacture uses Convex Sapphire.

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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.