Head-to-Head Comparison

Updated September 5, 2026

Casio MRW-230H vs Timex Marlin Automatic 40mm

Two timepieces compared — Under $50 vs $250–$500

Quick Verdict

The Casio MRW-230H (Under $50) offers Casio Quartz (Battery) precision in the tier below the Timex Marlin Automatic 40mm ($250–$500). The MRW-230H measures 44.6mm (47.9 x 44.6 x 12.3mm) and is rated 100m (10 ATM). The Marlin Automatic 40mm counters with Made in Japan (Movement) craftsmanship and 30m (3 ATM) water resistance. Both are exceptional timepieces for their respective tiers.

CasioMRW-230HUnder $50 Check price View the dossier

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Casio

MRW-230H

Under $50

Check Price Full Review

Timex

Marlin Automatic 40mm

$250–$500

View the dossier Full Review

Specifications Compared

Feature	Casio MRW-230H	Timex Marlin Automatic 40mm
Price	Under $50	$250–$500
Case Size	44.6mm (47.9 x 44.6 x 12.3mm)	40mm
Movement	Quartz	Automatic Miyota 8205
Caliber Type	Casio Quartz (Battery)	Miyota Automatic
Power Reserve	Approx. 3-year battery (SR626SW)	40 Hours
Water Resistance	100m (10 ATM)	30m (3 ATM)
Crystal	Resin Glass	Mineral Crystal
Case Material	Resin case, aluminum bezel ring	Stainless Steel
Origin	Casio (Japan)	Made in Japan (Movement)

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Timex'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 Timex Marlin Automatic 40mm offers Stainless Steel construction at 40mm with Mineral Crystal. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Timex

Quartz vs Automatic Miyota 8205

The MRW-230H runs the Quartz (Casio Quartz (Battery), Approx. 3-year battery (SR626SW) power reserve) at standard frequency. The Marlin Automatic 40mm uses the Automatic Miyota 8205 (Miyota Automatic, 40 Hours reserve) at 21,600 vph (3 Hz). The Marlin Automatic 40mm offers a longer power reserve.

📏

Wearability & Fit

Edge: Timex

44.6mm (47.9 x 44.6 x 12.3mm) vs 40mm — 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 Marlin Automatic 40mm at 40mm. 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 Timex Marlin Automatic 40mm at $250–$500. On the specs that outlast any price: the MRW-230H uses Resin Glass with Approx. 3-year battery (SR626SW), against Mineral Crystal and 40 Hours on the Marlin Automatic 40mm. 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 Marlin Automatic 40mm 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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Timex

Marlin Automatic 40mm

Choose the Timex Marlin Automatic 40mm if you value Miyota Automatic technology, Made in Japan (Movement) heritage, and 40mm proportions. At $250–$500, the Automatic Miyota 8205 with 40 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Casio MRW-230H and Timex Marlin Automatic 40mm represent two distinct approaches to the timepiece category — the Casio bringing Casio (Japan) tradition while Timex delivers Made in Japan (Movement) engineering.

Frequently Asked Questions

The Timex Marlin Automatic 40mm 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 $250–$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 Timex Marlin Automatic 40mm 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 Marlin Automatic 40mm at 40mm with 30m (3 ATM) is similarly capable. The MRW-230H uses Resin Glass while the Marlin Automatic 40mm uses Mineral Crystal.

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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.