Head-to-Head Comparison

Updated September 5, 2026

Casio F-91W vs Citizen Eco-Drive Weekender Chronograph

Casio's timepiece meets Citizen's chronograph

Quick Verdict

The Casio F-91W (Under $50) offers Casio Digital Quartz (Battery) precision in the tier below the Citizen Eco-Drive Weekender Chronograph ($150–$250). The F-91W measures 35mm and is rated 30m (Splash Resistant). The Eco-Drive Weekender Chronograph counters with Japanese Movement craftsmanship and 100m (10 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioF-91WUnder $50 Check price CitizenEco-Drive Weekender Chronograph$150–$250 Check price

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Casio

F-91W

Under $50

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Citizen

Eco-Drive Weekender Chronograph

$150–$250

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Specifications Compared

Feature	Casio F-91W	Citizen Eco-Drive Weekender Chronograph
Price	Under $50	$150–$250
Case Size	35mm	43mm
Movement	Quartz Module 593	Eco-Drive Caliber H500
Caliber Type	Casio Digital Quartz (Battery)	Citizen Eco-Drive Solar Quartz
Power Reserve	7-Year Battery	—
Water Resistance	30m (Splash Resistant)	100m (10 ATM)
Crystal	Acrylic	Mineral Crystal
Case Material	Resin	Stainless Steel
Origin	Casio (Japan)	Japanese Movement

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Citizen's approach

The Casio F-91W features a Resin case at 35mm with Acrylic protection. The Citizen Eco-Drive Weekender Chronograph offers Stainless Steel construction at 43mm with Mineral Crystal. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Casio

Quartz Module 593 vs Eco-Drive Caliber H500

The F-91W runs the Quartz Module 593 (Casio Digital Quartz (Battery), 7-Year Battery power reserve) at standard frequency. The Eco-Drive Weekender Chronograph uses the Eco-Drive Caliber H500 (Citizen Eco-Drive Solar Quartz, standard reserve) at standard. The F-91W edges ahead on power reserve.

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Wearability & Fit

Edge: Casio

35mm vs 43mm — different wrist presence

At 35mm, the F-91W wears more compactly on smaller wrists compared to the Eco-Drive Weekender Chronograph at 43mm. Water resistance differs: 30m (Splash Resistant) vs 100m (10 ATM).

💰

Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio F-91W sits at Under $50 and the Citizen Eco-Drive Weekender Chronograph at $150–$250. On the specs that outlast any price: the F-91W uses Acrylic with 7-Year Battery, against Mineral Crystal and a standard reserve on the Eco-Drive Weekender Chronograph. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Citizen

30m (Splash Resistant) vs 100m (10 ATM)

The F-91W is rated to 30m (Splash Resistant) while the Eco-Drive Weekender Chronograph handles 100m (10 ATM). The Eco-Drive Weekender Chronograph offers superior water resistance.

Our Verdict

Casio

F-91W

Choose the Casio F-91W if you prioritize Casio Digital Quartz (Battery) engineering, Casio (Japan) craftsmanship, and 30m (Splash Resistant) water resistance. At Under $50, it delivers Quartz Module 593 with 7-Year Battery power reserve.

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Citizen

Eco-Drive Weekender Chronograph

Choose the Citizen Eco-Drive Weekender Chronograph if you value Citizen Eco-Drive Solar Quartz technology, Japanese Movement heritage, and 43mm proportions. At $150–$250, the Eco-Drive Caliber H500 with ample power reserve makes it a compelling choice.

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The Bottom Line

The Casio F-91W and Citizen Eco-Drive Weekender Chronograph represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Citizen delivers Japanese Movement engineering.

Frequently Asked Questions

For water, the Citizen Eco-Drive Weekender Chronograph 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 F-91W sits a band lower (Under $50 against $150–$250), 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 F-91W offers better upfront value, sitting a tier lower at Under $50. However, the Citizen Eco-Drive Weekender Chronograph may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The F-91W at 35mm with 30m (Splash Resistant) water resistance handles everyday situations. The Eco-Drive Weekender Chronograph at 43mm with 100m (10 ATM) is similarly capable. The F-91W uses Acrylic while the Eco-Drive Weekender Chronograph 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.