Head-to-Head Comparison

Updated September 5, 2026

Casio MRW-230H vs Zenith Chronomaster El Primero Open Power Reserve (18k rose gold)

Casio's timepiece meets Zenith's chronograph

Quick Verdict

The Casio MRW-230H (Under $50) offers Casio Quartz (Battery) precision in the tier below the Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) ($10,000–$25,000). The MRW-230H measures 44.6mm (47.9 x 44.6 x 12.3mm) and is rated 100m (10 ATM). The Chronomaster El Primero Open Power Reserve (18k rose gold) counters with Swiss Made craftsmanship and 100m (10 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioMRW-230HUnder $50 Check price ZenithChronomaster El Primero Open Power Reserve (18k rose gold)$10,000–$25,000 Check price

Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.

Casio

MRW-230H

Under $50

Check Price Full Review

Zenith

Chronomaster El Primero Open Power Reserve (18k rose gold)

$10,000–$25,000

Check Price Full Review

Specifications Compared

Feature	Casio MRW-230H	Zenith Chronomaster El Primero Open Power Reserve (18k rose gold)
Price	Under $50	$10,000–$25,000
Case Size	44.6mm (47.9 x 44.6 x 12.3mm)	42mm
Movement	Quartz	Automatic chronograph, Zenith El Primero 4021
Caliber Type	Casio Quartz (Battery)	El Primero 4021, 36,000 vph (5 Hz), column wheel, automatic
Power Reserve	Approx. 3-year battery (SR626SW)	About 50 hours, with indicator
Water Resistance	100m (10 ATM)	100m (10 ATM)
Crystal	Resin Glass	Sapphire Crystal, sapphire exhibition caseback
Case Material	Resin case, aluminum bezel ring	18k rose gold
Origin	Casio (Japan)	Swiss Made

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Zenith'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 Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) offers 18k rose gold construction at 42mm with Sapphire Crystal, sapphire exhibition caseback. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Zenith

Quartz vs Automatic chronograph, Zenith El Primero 4021

The MRW-230H runs the Quartz (Casio Quartz (Battery), Approx. 3-year battery (SR626SW) power reserve) at standard frequency. The Chronomaster El Primero Open Power Reserve (18k rose gold) uses the Automatic chronograph, Zenith El Primero 4021 (El Primero 4021, 36,000 vph (5 Hz), column wheel, automatic, About 50 hours, with indicator reserve) at standard. The Chronomaster El Primero Open Power Reserve (18k rose gold) offers a longer power reserve.

📏

Wearability & Fit

Edge: Zenith

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 Chronomaster El Primero Open Power Reserve (18k rose gold) at 42mm. Water resistance differs: 100m (10 ATM) vs 100m (10 ATM).

💰

Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio MRW-230H sits at Under $50 and the Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) at $10,000–$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 exhibition caseback and About 50 hours, with indicator on the Chronomaster El Primero Open Power Reserve (18k rose gold). Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Draw

100m (10 ATM) vs 100m (10 ATM)

The MRW-230H is rated to 100m (10 ATM) while the Chronomaster El Primero Open Power Reserve (18k rose gold) handles 100m (10 ATM). Both offer identical water resistance ratings.

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.

Check Price on Amazon

Zenith

Chronomaster El Primero Open Power Reserve (18k rose gold)

Choose the Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) if you value El Primero 4021, 36,000 vph (5 Hz), column wheel, automatic technology, Swiss Made heritage, and 42mm proportions. At $10,000–$25,000, the Automatic chronograph, Zenith El Primero 4021 with About 50 hours, with indicator power reserve makes it a compelling choice.

Check Price on Amazon

Try Prime Free — Free Shipping on Both Watches Students & 18–24: start Prime for Young Adults free

The Bottom Line

The Casio MRW-230H and Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Zenith delivers Swiss Made engineering.

Frequently Asked Questions

The Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) 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. On price, the Casio MRW-230H sits a band lower (Under $50 against $10,000–$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 Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) 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 Chronomaster El Primero Open Power Reserve (18k rose gold) at 42mm with 100m (10 ATM) is similarly capable. The MRW-230H uses Resin Glass while the Chronomaster El Primero Open Power Reserve (18k rose gold) uses Sapphire Crystal, sapphire exhibition caseback.

More Comparisons

Tag Heuer Carrera Chronograph vs Casio MRW-230H

Tag Heuer's chronograph meets Casio's timepiece

Tag Heuer Carrera Chronograph vs Zenith Chronomaster El Primero Open Power Reserve (18k rose gold)

Two chronographs compared — $2,500–$5,000 vs $10,000–$25,000

Tissot PRX Powermatic 80 vs Casio MRW-230H

Two timepieces compared — $500–$1,000 vs Under $50

Explore These Watches

Casio MRW-230H — Full Review Zenith Chronomaster El Primero Open Power Reserve (18k rose gold) — Full Review Browse All Guides

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.